PHP 允许创建 callable,可用作回调参数,但无法直接调用。它们是上下文相关的 callable,引用类继承层次中的某个类方法,例如'parent::method'或[ static , method ]。 注意:自 PHP 8.2...www.php.net

PHP 中的日期/时间功能实现了 ISO 8601 历法,这是 » 前公历,实现了公历之前的当前闰日规则,并且还包括0年作为介于两者之间的年份——公元前 1 年和公元 1 年。不支持闰秒。 日期和时间信息...www.php.net

Whendouble_encodeis turned off PHP will not encode existing html entities, the default is to convert everything. Return Values The converted string. If the inputstringcontains an i...www.php.net

As of PHP 7.1.0list()can now also contain explicit keys, which can be given as arbitrary expressions. Mixing of integer and string keys is allowed; however, elements with and witho...www.php.net

echosubstr( abcdef ,0, -1),PHP_EOL;// 返回 abcde echosubstr( abcdef ,2, -1),PHP_EOL;// 返回 cde echosubstr( abcdef ,4, -4),PHP_EOL;// 返回 ; 在 PHP 8.0.0 之前,返回 false echosubs...www.php.netTIME.rfTime = +new Date;

Deprecated as of PHP 8.4.0. Actual encoding of the document, is a readonly equivalent toencoding. childElementCount The number of child elements. config Deprecated as of PHP 8.4.0...www.php.net