锟斤拷锟杰大部凤拷 PHP 4 锟侥达拷锟斤拷应锟矫诧拷锟斤拷锟睫改撅拷锟斤拷锟斤拷锟叫ｏ拷锟斤拷锟斤拷应锟斤拷锟斤拷锟斤拷锟斤拷锟铰诧拷锟斤拷锟铰硷拷锟捷的改变：
E_ERROR 锟斤拷锟斤拷锟斤拷
E_WARNING锟斤拷一锟斤拷锟角凤拷使锟矫碉拷锟斤拷锟接ｏ拷$str = 'abc'; unset($str[0]);.
E_WARNING 锟斤拷息锟斤拷要小锟斤拷锟斤拷为锟斤拷拇锟斤拷锟斤拷锌锟斤拷芊锟今发筹拷
E_WARNING锟斤拷
T_ML_COMMENT 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟�
error_reporting 锟斤拷为 E_ALL锟斤拷PHP
锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷息锟斤拷锟斤拷锟斤拷 T_ML_COMMENT
锟斤拷锟斤拷锟斤拷没锟矫碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 PHP 4 锟叫讹拷锟斤拷锟剿★拷锟斤拷 PHP 4 锟斤拷 PHP 5
锟斤拷 // 锟斤拷 /* */ 锟斤拷锟斤拷锟斤拷锟斤拷为 T_COMMENT
锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 PHPDoc 锟斤拷锟斤拷注锟斤拷 /** */锟斤拷锟斤拷 PHP 5 锟斤拷始锟斤拷
PHP 锟斤拷锟斤拷锟斤拷锟斤拷识锟斤拷为 T_DOC_COMMENT锟斤拷
__CLASS__锟斤拷__METHOD__
锟斤拷 __FUNCTION__锟斤拷锟斤拷值锟斤拷锟斤拷锟较革拷锟秸讹拷锟斤拷时锟斤拷锟斤拷锟街凤拷锟截ｏ拷锟斤拷锟街达拷小写锟斤拷锟斤拷
FALSE锟斤拷锟斤拷锟斤拷锟斤拷
-1锟斤拷
Example #1 strrpos() 锟斤拷 strripos() 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷址锟斤拷锟斤拷锟轿� needle
<?php
var_dump(strrpos('ABCDEF','DEF')); //int(3)
var_dump(strrpos('ABCDEF','DAF')); //bool(false)
?>
Example #2 没锟斤拷锟斤拷锟皆的讹拷锟斤拷锟劫憋拷锟斤拷锟斤拷"empty"
<?php
class test { }
$t = new test();
var_dump(empty($t)); // echo bool(false)
if ($t) {
// Will be executed
}
?>
Example #3 锟斤拷些锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷使锟斤拷之前锟斤拷锟斤拷
<?php
//works with no errors:
$a = new a();
class a {
}
//throws an error:
$a = new b();
interface c{
}
class b implements c {
}
?>