{"id":1206,"date":"2015-12-09T22:26:40","date_gmt":"2015-12-09T14:26:40","guid":{"rendered":"http:\/\/i.actom.me\/?p=1206"},"modified":"2015-12-09T22:26:40","modified_gmt":"2015-12-09T14:26:40","slug":"%e8%bd%acphp-7%e6%96%b0%e7%89%b9%e6%80%a7","status":"publish","type":"post","link":"https:\/\/actom.me\/blog\/%e8%bd%acphp-7%e6%96%b0%e7%89%b9%e6%80%a7.html","title":{"rendered":"[\u8f6c]PHP 7\u65b0\u7279\u6027"},"content":{"rendered":"
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\u6807\u91cf\u7c7b\u578b\u58f0\u660e \u00b6<\/a><\/h3>\n

\u6807\u91cf\u7c7b\u578b\u58f0\u660e<\/a> \u6709\u4e24\u79cd\u6a21\u5f0f: \u5f3a\u5236 (\u9ed8\u8ba4) \u548c \u4e25\u683c\u6a21\u5f0f\u3002 \u73b0\u5728\u53ef\u4ee5\u4f7f\u7528\u4e0b\u5217\u7c7b\u578b\u53c2\u6570\uff08\u65e0\u8bba\u7528\u5f3a\u5236\u6a21\u5f0f\u8fd8\u662f\u4e25\u683c\u6a21\u5f0f\uff09\uff1a \u5b57\u7b26\u4e32(string<\/a><\/span>), \u6574\u6570 (int<\/em>), \u6d6e\u70b9\u6570 (float<\/a><\/span>), \u4ee5\u53ca\u5e03\u5c14\u503c (bool<\/em>)\u3002\u5b83\u4eec\u6269\u5145\u4e86PHP5\u4e2d\u5f15\u5165\u7684\u5176\u4ed6\u7c7b\u578b\uff1a\u7c7b\u540d\uff0c\u63a5\u53e3\uff0c\u6570\u7ec4<\/span><\/span>\u548c \u56de\u8c03\u7c7b\u578b<\/span><\/span>\u3002<\/p>\n

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<?php\r\n\/\/ Coercive mode\r\nfunction sumOfInts(int ...$ints)\r\n{\r\n    return array_sum($ints);\r\n}\r\n\r\nvar_dump(sumOfInts(2, '3', 4.1));<\/pre>\n<\/div>\n<\/div>\n
\u4ee5\u4e0a\u4f8b\u7a0b\u4f1a\u8f93\u51fa\uff1a<\/p>\n
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int(9)\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n
\u8981\u4f7f\u7528\u4e25\u683c\u6a21\u5f0f\uff0c\u4e00\u4e2a declare<\/em><\/a> \u58f0\u660e\u6307\u4ee4\u5fc5\u987b\u653e\u5728\u6587\u4ef6\u7684\u9876\u90e8\u3002\u8fd9\u610f\u5473\u7740\u4e25\u683c\u58f0\u660e\u6807\u91cf\u662f\u57fa\u4e8e\u6587\u4ef6\u53ef\u914d\u7684\u3002 \u8fd9\u4e2a\u6307\u4ee4\u4e0d\u4ec5\u5f71\u54cd\u53c2\u6570\u7684\u7c7b\u578b\u58f0\u660e\uff0c\u4e5f\u5f71\u54cd\u5230\u51fd\u6570\u7684\u8fd4\u56de\u503c\u58f0\u660e\uff08\u53c2\u89c1 \u8fd4\u56de\u503c\u7c7b\u578b\u58f0\u660e<\/a>, \u5185\u7f6e\u7684PHP\u51fd\u6570\u4ee5\u53ca\u6269\u5c55\u4e2d\u52a0\u8f7d\u7684PHP\u51fd\u6570\uff09<\/p>\n
\u5b8c\u6574\u7684\u6807\u91cf\u7c7b\u578b\u58f0\u660e\u6587\u6863\u548c\u793a\u4f8b\u53c2\u89c1\u7c7b\u578b\u58f0\u660e<\/a>\u7ae0\u8282\u3002<\/p>\n<\/div>\n
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\u8fd4\u56de\u503c\u7c7b\u578b\u58f0\u660e \u00b6<\/a><\/h3>\n
PHP 7 \u589e\u52a0\u4e86\u5bf9\u8fd4\u56de\u7c7b\u578b\u58f0\u660e<\/a>\u7684\u652f\u6301\u3002 \u7c7b\u4f3c\u4e8e\u53c2\u6570\u7c7b\u578b\u58f0\u660e<\/a>\uff0c\u8fd4\u56de\u7c7b\u578b\u58f0\u660e\u6307\u660e\u4e86\u51fd\u6570\u8fd4\u56de\u503c\u7684\u7c7b\u578b\u3002\u53ef\u7528\u7684\u7c7b\u578b<\/a>\u4e0e\u53c2\u6570\u58f0\u660e\u4e2d\u53ef\u7528\u7684\u7c7b\u578b\u76f8\u540c\u3002<\/p>\n
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<?php\r\n\r\nfunction arraysSum(array ...$arrays): array\r\n{\r\n    return array_map(function(array $array): int {\r\n        return array_sum($array);\r\n    }, $arrays);\r\n}\r\n\r\nprint_r(arraysSum([1,2,3],\u00a0[4,5,6],\u00a0[7,8,9])); <\/code><\/pre>\n<\/div>\n<\/div>\n
\u4ee5\u4e0a\u4f8b\u7a0b\u4f1a\u8f93\u51fa\uff1a<\/p>\n
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Array\r\n(\r\n    [0] => 6\r\n    [1] => 15\r\n    [2] => 24\r\n)\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n
\u5b8c\u6574\u7684\u6807\u91cf\u7c7b\u578b\u58f0\u660e\u6587\u6863\u548c\u793a\u4f8b\u53ef\u53c2\u89c1 \u8fd4\u56de\u503c\u7c7b\u578b\u58f0\u660e<\/a>.<\/p>\n<\/div>\n
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null\u5408\u5e76\u8fd0\u7b97\u7b26 \u00b6<\/a><\/h3>\n
\u7531\u4e8e\u65e5\u5e38\u4f7f\u7528\u4e2d\u5b58\u5728\u5927\u91cf\u540c\u65f6\u4f7f\u7528\u4e09\u5143\u8868\u8fbe\u5f0f\u548c isset()<\/a><\/span>\u7684\u60c5\u51b5\uff0c \u6211\u4eec\u6dfb\u52a0\u4e86null\u5408\u5e76\u8fd0\u7b97\u7b26 (??<\/em>) \u8fd9\u4e2a\u8bed\u6cd5\u7cd6\u3002\u5982\u679c\u53d8\u91cf\u5b58\u5728\u4e14\u503c\u4e0d\u4e3aNULL<\/code><\/strong>\uff0c \u5b83\u5c31\u4f1a\u8fd4\u56de\u81ea\u8eab\u7684\u503c\uff0c\u5426\u5219\u8fd4\u56de\u5b83\u7684\u7b2c\u4e8c\u4e2a\u64cd\u4f5c\u6570\u3002<\/p>\n
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<?php\r\n\/\/ Fetches the value of $_GET['user'] and returns 'nobody'\r\n\/\/ if it does not exist.\r\n$username = $_GET['user'] ?? 'nobody';\r\n\/\/ This is equivalent to:\r\n$username = isset($_GET['user']) ? $_GET['user'] : 'nobody';\r\n\r\n\/\/ Coalesces can be chained: this will return the first\r\n\/\/ defined value out of $_GET['user'], $_POST['user'], and\r\n\/\/ 'nobody'.\r\n$username = $_GET['user'] ?? $_POST['user'] ?? 'nobody';\r\n?><\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\u592a\u7a7a\u8239\u64cd\u4f5c\u7b26\uff08\u7ec4\u5408\u6bd4\u8f83\u7b26\uff09 \u00b6<\/a><\/h3>\n
\u592a\u7a7a\u8239\u64cd\u4f5c\u7b26\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u8868\u8fbe\u5f0f\u3002\u5f53$a<\/var><\/var>\u5927\u4e8e\u3001\u7b49\u4e8e\u6216\u5c0f\u4e8e$b<\/var><\/var>\u65f6\u5b83\u5206\u522b\u8fd4\u56de-1\u30010\u62161\u3002 \u6bd4\u8f83\u7684\u539f\u5219\u662f\u6cbf\u7528 PHP \u7684\u5e38\u89c4\u6bd4\u8f83\u89c4\u5219<\/a>\u8fdb\u884c\u7684\u3002<\/p>\n
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<?php\r\n\/\/ Integers\r\necho 1 <=> 1; \/\/ 0\r\necho 1 <=> 2; \/\/ -1\r\necho 2 <=> 1; \/\/ 1\r\n\r\n\/\/ Floats\r\necho 1.5 <=> 1.5; \/\/ 0\r\necho 1.5 <=> 2.5; \/\/ -1\r\necho 2.5 <=> 1.5; \/\/ 1\r\n \r\n\/\/ Strings\r\necho \"a\" <=> \"a\"; \/\/ 0\r\necho \"a\" <=> \"b\"; \/\/ -1\r\necho \"b\" <=> \"a\"; \/\/ 1\r\n?><\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\u901a\u8fc7 define()<\/a><\/span> \u5b9a\u4e49\u5e38\u91cf\u6570\u7ec4  \u00b6<\/a><\/h3>\n
Array<\/a><\/span> \u7c7b\u578b\u7684\u5e38\u91cf\u73b0\u5728\u53ef\u4ee5\u901a\u8fc7 definedefine()<\/a><\/span> \u6765\u5b9a\u4e49\u3002\u5728 PHP5.6 \u4e2d\u4ec5\u80fd\u901a\u8fc7 const<\/em><\/a> \u5b9a\u4e49\u3002<\/p>\n
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<?php\r\ndefine('ANIMALS', [\r\n    'dog',\r\n    'cat',\r\n    'bird'\r\n]);\r\n\r\necho ANIMALS[1]; \/\/ outputs \"cat\"\r\n?><\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\u533f\u540d\u7c7b \u00b6<\/a><\/h3>\n
\u73b0\u5728\u652f\u6301\u901a\u8fc7new class<\/em> \u6765\u5b9e\u4f8b\u5316\u4e00\u4e2a\u533f\u540d\u7c7b\uff0c\u8fd9\u53ef\u4ee5\u7528\u6765\u66ff\u4ee3\u4e00\u4e9b\u201c\u7528\u540e\u5373\u711a\u201d\u7684\u5b8c\u6574\u7c7b\u5b9a\u4e49\u3002<\/p>\n
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<?php\r\ninterface Logger {\r\n    public function log(string $msg);\r\n}\r\n\r\nclass Application {\r\n    private $logger;\r\n\r\n    public function getLogger(): Logger {\r\n         return $this->logger;\r\n    }\r\n\r\n    public function setLogger(Logger $logger) {\r\n         $this->logger = $logger;\r\n    }\r\n}\r\n\r\n$app = new Application;\r\n$app->setLogger(new class implements Logger {\r\n    public function log(string $msg) {\r\n        echo $msg;\r\n    }\r\n});\r\n\r\nvar_dump($app->getLogger());\r\n?><\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n
\u4ee5\u4e0a\u4f8b\u7a0b\u4f1a\u8f93\u51fa\uff1a<\/p>\n
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object(class@anonymous)#2 (0) {\r\n}\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n
\u8be6\u7ec6\u6587\u6863\u53ef\u4ee5\u53c2\u8003 \u533f\u540d\u7c7b<\/a>.<\/p>\n<\/div>\n
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Unicode codepoint \u8f6c\u8bd1\u8bed\u6cd5 \u00b6<\/a><\/h3>\n
\u8fd9\u63a5\u53d7\u4e00\u4e2a\u4ee516\u8fdb\u5236\u5f62\u5f0f\u7684 Unicode codepoint\uff0c\u5e76\u6253\u5370\u51fa\u4e00\u4e2a\u53cc\u5f15\u53f7\u6216heredoc\u5305\u56f4\u7684 UTF-8 \u7f16\u7801\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3002 \u53ef\u4ee5\u63a5\u53d7\u4efb\u4f55\u6709\u6548\u7684 codepoint\uff0c\u5e76\u4e14\u5f00\u5934\u7684 0 \u662f\u53ef\u4ee5\u7701\u7565\u7684\u3002<\/p>\n
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echo \"\\u{aa}\";\r\necho \"\\u{0000aa}\";\r\necho \"\\u{9999}\";<\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n
\u4ee5\u4e0a\u4f8b\u7a0b\u4f1a\u8f93\u51fa\uff1a<\/p>\n
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\u00aa\r\n\u00aa (same as before but with optional leading 0's)\r\n\u9999\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Closure::call()<\/strong><\/span> \u00b6<\/a><\/h3>\n
Closure::call()<\/strong><\/span> \u73b0\u5728\u6709\u7740\u66f4\u597d\u7684\u6027\u80fd\uff0c\u7b80\u77ed\u5e72\u7ec3\u7684\u6682\u65f6\u7ed1\u5b9a\u4e00\u4e2a\u65b9\u6cd5\u5230\u5bf9\u8c61\u4e0a\u95ed\u5305\u5e76\u8c03\u7528\u5b83\u3002<\/p>\n
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<?php\r\nclass A {private $x = 1;}\r\n\r\n\/\/ Pre PHP 7 code\r\n$getXCB = function() {return $this->x;};\r\n$getX = $getXCB->bindTo(new A, 'A'); \/\/ intermediate closure\r\necho $getX();\r\n\r\n\/\/ PHP 7+ code\r\n$getX = function() {return $this->x;};\r\necho $getX->call(new A);<\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n
\u4ee5\u4e0a\u4f8b\u7a0b\u4f1a\u8f93\u51fa\uff1a<\/p>\n
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1\r\n1\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\u4e3aunserialize()<\/a><\/span>\u63d0\u4f9b\u8fc7\u6ee4 \u00b6<\/a><\/h3>\n
\u8fd9\u4e2a\u7279\u6027\u65e8\u5728\u63d0\u4f9b\u66f4\u5b89\u5168\u7684\u65b9\u5f0f\u89e3\u5305\u4e0d\u53ef\u9760\u7684\u6570\u636e\u3002\u5b83\u901a\u8fc7\u767d\u540d\u5355\u7684\u65b9\u5f0f\u6765\u9632\u6b62\u6f5c\u5728\u7684\u4ee3\u7801\u6ce8\u5165\u3002<\/p>\n
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<?php\r\n\r\n\/\/ converts all objects into __PHP_Incomplete_Class object\r\n$data = unserialize($foo, [\"allowed_classes\" => false]);\r\n\r\n\/\/ converts all objects into __PHP_Incomplete_Class object except those of MyClass and MyClass2\r\n$data = unserialize($foo, [\"allowed_classes\" => [\"MyClass\", \"MyClass2\"]);\r\n\r\n\/\/ default behaviour (same as omitting the second argument) that accepts all classes\r\n$data = unserialize($foo, [\"allowed_classes\" => true]);<\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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IntlChar<\/a> \u00b6<\/a><\/h3>\n
\u65b0\u589e\u52a0\u7684 IntlChar<\/a> \u7c7b\u65e8\u5728\u66b4\u9732\u51fa\u66f4\u591a\u7684 ICU \u529f\u80fd\u3002\u8fd9\u4e2a\u7c7b\u81ea\u8eab\u5b9a\u4e49\u4e86\u8bb8\u591a\u9759\u6001\u65b9\u6cd5\u7528\u4e8e\u64cd\u4f5c\u591a\u5b57\u7b26\u96c6\u7684 unicode \u5b57\u7b26\u3002<\/p>\n
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<?php\r\n\r\nprintf('%x', IntlChar::CODEPOINT_MAX);\r\necho IntlChar::charName('@');\r\nvar_dump(IntlChar::ispunct('!'));<\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n
\u4ee5\u4e0a\u4f8b\u7a0b\u4f1a\u8f93\u51fa\uff1a<\/p>\n
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10ffff\r\nCOMMERCIAL AT\r\nbool(true)\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n
\u82e5\u8981\u4f7f\u7528\u6b64\u7c7b\uff0c\u8bf7\u5148\u5b89\u88c5Intl<\/a>\u6269\u5c55<\/p>\n<\/div>\n
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\u9884\u671f \u00b6<\/a><\/h3>\n
\u9884\u671f<\/a>\u662f\u5411\u540e\u517c\u7528\u5e76\u589e\u5f3a\u4e4b\u524d\u7684 assert()<\/a><\/span> \u7684\u65b9\u6cd5\u3002 \u5b83\u4f7f\u5f97\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u542f\u7528\u65ad\u8a00\u4e3a\u96f6\u6210\u672c\uff0c\u5e76\u4e14\u63d0\u4f9b\u5f53\u65ad\u8a00\u5931\u8d25\u65f6\u629b\u51fa\u7279\u5b9a\u5f02\u5e38\u7684\u80fd\u529b\u3002<\/p>\n
\u8001\u7248\u672c\u7684API\u51fa\u4e8e\u517c\u5bb9\u76ee\u7684\u5c06\u7ee7\u7eed\u88ab\u7ef4\u62a4\uff0cassert()<\/a><\/span>\u73b0\u5728\u662f\u4e00\u4e2a\u8bed\u8a00\u7ed3\u6784\uff0c\u5b83\u5141\u8bb8\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u8868\u8fbe\u5f0f\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u4e00\u4e2a\u5f85\u8ba1\u7b97\u7684 string<\/a><\/span>\u6216\u4e00\u4e2a\u5f85\u6d4b\u8bd5\u7684boolean<\/a><\/span>\u3002<\/p>\n
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<?php\r\nini_set('assert.exception', 1);\r\n\r\nclass CustomError extends AssertionError {}\r\n\r\nassert(false, new CustomError('Some error message'));\r\n?><\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n
\u4ee5\u4e0a\u4f8b\u7a0b\u4f1a\u8f93\u51fa\uff1a<\/p>\n
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Fatal error: Uncaught CustomError: Some error message\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n
\u5173\u4e8e\u8fd9\u4e2a\u7279\u6027\u7684\u5b8c\u6574\u8bf4\u660e\uff0c\u5305\u62ec\u5982\u4f55\u5728\u5f00\u53d1\u548c\u751f\u4ea7\u73af\u5883\u4e2d\u914d\u7f6e\u5b83\uff0c\u53ef\u4ee5\u5728assert()<\/a><\/span>\u7684 expectations section<\/a>\u7ae0\u8282\u627e\u5230\u3002<\/p>\n<\/div>\n
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Group use<\/em> declarations \u00b6<\/a><\/h3>\n
\u4ece\u540c\u4e00 namespace<\/em><\/a> \u5bfc\u5165\u7684\u7c7b\u3001\u51fd\u6570\u548c\u5e38\u91cf\u73b0\u5728\u53ef\u4ee5\u901a\u8fc7\u5355\u4e2a use<\/em><\/a> \u8bed\u53e5 \u4e00\u6b21\u6027\u5bfc\u5165\u4e86\u3002<\/p>\n
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<?php\r\n\r\n\/\/ Pre PHP 7 code\r\nuse some\\namespace\\ClassA;\r\nuse some\\namespace\\ClassB;\r\nuse some\\namespace\\ClassC as C;\r\n\r\nuse function some\\namespace\\fn_a;\r\nuse function some\\namespace\\fn_b;\r\nuse function some\\namespace\\fn_c;\r\n\r\nuse const some\\namespace\\ConstA;\r\nuse const some\\namespace\\ConstB;\r\nuse const some\\namespace\\ConstC;\r\n\r\n\/\/ PHP 7+ code\r\nuse some\\namespace\\{ClassA, ClassB, ClassC as C};\r\nuse function some\\namespace\\{fn_a, fn_b, fn_c};\r\nuse const some\\namespace\\{ConstA, ConstB, ConstC};\r\n?><\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Generator Return Expressions \u00b6<\/a><\/h3>\n
This feature builds upon the generator functionality introduced into PHP 5.5. It enables for a return<\/em> statement to be used within a generator to enable for a final expression to be returned (return by reference is not allowed). This value can be fetched using the new Generator::getReturn()<\/em> method, which may only be used once the generator has finishing yielding values.<\/p>\n
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<?php\r\n\r\n$gen = (function() {\r\n    yield 1;\r\n    yield 2;\r\n\r\n    return 3;\r\n})();\r\n\r\nforeach ($gen as $val) {\r\n    echo $val, PHP_EOL;\r\n}\r\n\r\necho\u00a0$gen->getReturn(),\u00a0PHP_EOL; <\/code><\/pre>\n
\u4ee5\u4e0a\u4f8b\u7a0b\u4f1a\u8f93\u51fa\uff1a<\/p><\/div>\n<\/div>\n
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1\r\n2\r\n3\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n
Being able to explicitly return a final value from a generator is a handy ability to have. This is because it enables for a final value to be returned by a generator (from perhaps some form of coroutine computation) that can be specifically handled by the client code executing the generator. This is far simpler than forcing the client code to firstly check whether the final value has been yielded, and then if so, to handle that value specifically.<\/p>\n<\/div>\n
\n
Generator delegation \u00b6<\/a><\/h3>\n
Generators can now delegate to another generator, Traversable<\/strong> object or array<\/a><\/span> automatically, without needing to write boilerplate in the outermost generator by using the yield from<\/em><\/a> construct.<\/p>\n
\n
\n
\n
<?php\r\n\r\nfunction gen()\r\n{\r\n    yield 1;\r\n    yield 2;\r\n\r\n    yield from gen2();\r\n}\r\n\r\nfunction gen2()\r\n{\r\n    yield 3;\r\n    yield 4;\r\n}\r\n\r\nforeach (gen() as $val)\r\n{\r\n    echo $val, PHP_EOL;\r\n}\r\n\r\n?><\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n
\u4ee5\u4e0a\u4f8b\u7a0b\u4f1a\u8f93\u51fa\uff1a<\/p>\n
\n
\n
1\r\n2\r\n3\r\n4\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n
Integer division with intdiv()<\/a><\/span> \u00b6<\/a><\/h3>\n
The new intdiv()<\/a><\/span> function performs an integer division of its operands and returns it.<\/p>\n
\n
\n
\n
<?php\r\n\r\nvar_dump(intdiv(10, 3));\r\n?><\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n
\u4ee5\u4e0a\u4f8b\u7a0b\u4f1a\u8f93\u51fa\uff1a<\/p>\n
\n
\n
int(3)\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n
Session options \u00b6<\/a><\/h3>\n
session_start()<\/a><\/span> now accepts an array<\/a><\/span> of options that override the session configuration directives<\/a> normally set in php.ini.<\/p>\n
These options have also been expanded to support session.lazy_write<\/a>, which is on by default and causes PHP to only overwrite any session file if the session data has changed, and read_and_close<\/em>, which is an option that can only be passed to session_start()<\/a><\/span> to indicate that the session data should be read and then the session should immediately be closed unchanged.<\/p>\n
For example, to set session.cache_limiter<\/a> to private<\/em> and immediately close the session after reading it:<\/p>\n
\n
\n
\n
<?php\r\nsession_start([\r\n    'cache_limiter' => 'private',\r\n    'read_and_close' => true,\r\n]);\r\n?><\/pre>\n
 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n
preg_replace_callback_array()<\/a><\/span> \u00b6<\/a><\/h3>\n
The new preg_replace_callback_array()<\/a><\/span> function enables code to be written more cleanly when using the preg_replace_callback()<\/a><\/span> function. Prior to PHP 7, callbacks that needed to be executed per regular expression required the callback function to be polluted with lots of branching.<\/p>\n
Now, callbacks can be registered to each regular expression using an associative array, where the key is a regular expression and the value is a callback.<\/p>\n<\/div>\n
\n
CSPRNG<\/a> Functions \u00b6<\/a><\/h3>\n
Two new functions have been added to generate cryptographically secure integers and strings in a cross platform way: random_bytes()<\/a><\/span> and random_int()<\/a><\/span>.<\/p>\n<\/div>\n
\n
list()<\/a><\/span> can always unpack objects implementing ArrayAccess<\/strong> \u00b6<\/a><\/h3>\n
Previously, list()<\/a><\/span> was not guaranteed to operate correctly with objects implementing ArrayAccess<\/strong>. This has been fixed.<\/p>\n<\/div>\n
\n
\u672c\u6587\u8f6c\u81ea\uff1ahttp:\/\/php.net\/manual\/zh\/migration70.new-features.php<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6807\u91cf\u7c7b\u578b\u58f0\u660e \u00b6 \u6807\u91cf\u7c7b\u578b\u58f0\u660e \u6709\u4e24\u79cd\u6a21\u5f0f: \u5f3a\u5236 (\u9ed8\u8ba4) \u548c \u4e25\u683c\u6a21\u5f0f\u3002 \u73b0 … Read More »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,3],"tags":[],"_links":{"self":[{"href":"https:\/\/actom.me\/blog\/wp-json\/wp\/v2\/posts\/1206"}],"collection":[{"href":"https:\/\/actom.me\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/actom.me\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/actom.me\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/actom.me\/blog\/wp-json\/wp\/v2\/comments?post=1206"}],"version-history":[{"count":1,"href":"https:\/\/actom.me\/blog\/wp-json\/wp\/v2\/posts\/1206\/revisions"}],"predecessor-version":[{"id":1207,"href":"https:\/\/actom.me\/blog\/wp-json\/wp\/v2\/posts\/1206\/revisions\/1207"}],"wp:attachment":[{"href":"https:\/\/actom.me\/blog\/wp-json\/wp\/v2\/media?parent=1206"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/actom.me\/blog\/wp-json\/wp\/v2\/categories?post=1206"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/actom.me\/blog\/wp-json\/wp\/v2\/tags?post=1206"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}