PHP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闂鎬荤粨濡備笅銆傚鏋滄偍浠旂粏闃呰杩嘝HP鐨勬墜鍐岋紝閭ｄ箞灏辨病蹇呰鍐嶇湅杩欑瘒鏂囩珷浜嗭紝杩欑瘒鏂囩珷鏄啓缁欑湅鎵嬪唽涓嶇敤蹇冪殑鍚屽鐨勩€?/p>
棣栧厛瑕佸己璋冪殑涓€鐐规槸PHP unset鍏ㄥ眬鍙橀噺鍦≒HP涓凡缁忎笉鍐嶆槸涓€涓嚱鏁颁簡锛屾棦鐒朵笉鏄嚱鏁帮紝閭ｄ箞灏辨病鏈変簡杩斿洖鍊硷紝鎵€浠ョ敤鐨勬椂鍊欎笉鑳藉鐢╱nset鐨勮繑鍥炲€兼潵鍋氬垽鏂€?/p>
鍏舵锛屽湪鍑芥暟涓紝PHP unset鍏ㄥ眬鍙橀噺鍙兘閿€姣佸眬閮ㄥ彉閲忥紝骞朵笉鑳介攢姣佸叏灞€鍙橀噺锛屾潵鐪嬩笅鎵嬪唽鐨勪竴涓緥瀛?/p>
<ol class="dp-xml">
<li class="alt"><span class="tag"> ?PHP </span></li>
<li><span>function destroy_foo() { </span></li>
<li class="alt"><span>global $foo; </span></li>
<li><span>unset($foo); </span></li>
<li class="alt"><span>} </span></li>
<li>
<span>$</span><span class="attribute">foo</span><span> = ‘bar’; </span>
</li>
<li class="alt"><span>destroy_foo(); </span></li>
<li><span>echo $foo; </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>杩斿洖鐨勭粨鏋滀负
bar
涓轰粈涔堜細杩欐牱鍛紵鍘熷洜灏辨槸PHP unset鍏ㄥ眬鍙橀噺鍦ㄥ嚱鏁颁腑鍙兘閿€姣佸眬閮ㄥ彉閲忋€傚鏋滃湪绋嬪簭涓渶瑕佺敤鍒伴攢姣佸叏灞€鍙橀噺鐨勫簲璇ュ浣曞仛鍛紵涔熷緢绠€鍗曪紝鐢?GLOBALS鏁扮粍鏉ュ疄鐜般€傜湅涓嬮潰鐨勪緥瀛愶細
<ol class="dp-xml">
<li class="alt"><span class="tag"> ?PHP </span></li>
<li><span>function foo() { </span></li>
<li class="alt"><span>unset($GLOBALS['bar']); </span></li>
<li><span>} </span></li>
<li class="alt">
<span>$</span><span class="attribute">bar</span><span> = “something”; </span>
</li>
<li><span>foo(); </span></li>
<li class="alt"><span>var_dump($bar); </span></li>
<li>
<span class="tag">?></span><span> </span>
</li>
</ol>
