PHPunset鍏ㄥ眬鍙橀噺杩愮敤闂璇﹁В_PHP鏁欑▼|甯涔嬪

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< ?PHP  
function destroy_foo() {  
global $foo;  
unset($foo);  
}  
$foo = ‘bar’;  
destroy_foo();  
echo $foo;  
?> 

杩斿洖鐨勭粨鏋滀负

bar

涓轰粈涔堜細杩欐牱鍛紵鍘熷洜灏辨槸PHP unset鍏ㄥ眬鍙橀噺鍦ㄥ嚱鏁颁腑鍙兘閿€姣佸眬閮ㄥ彉閲忋€傚鏋滃湪绋嬪簭涓渶瑕佺敤鍒伴攢姣佸叏灞€鍙橀噺鐨勫簲璇ュ浣曞仛鍛紵涔熷緢绠€鍗曪紝鐢?GLOBALS鏁扮粍鏉ュ疄鐜般€傜湅涓嬮潰鐨勪緥瀛愶細

< ?PHP  
function foo() {  
unset($GLOBALS['bar']);  
}  
$bar = “something”;  
foo();  
var_dump($bar);  
?> 

http://www.bkjia.com/PHPjc/445986.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/445986.htmlTechArticlePHP涓湁涓噴鏀惧彉閲忕殑璇彞鍙仛unset锛堜粠PHP4寮€濮媢nset宸茬粡涓嶅啀鏄竴涓嚱鏁颁簡锛岃€屾槸涓€涓鍙ワ級锛屽墠鍑犲ぉ鐢╱nset鐨勬椂鍊欏嚭浜嗙偣闂锛屼簬鏄妸unset闂?..