PHP unset鍏ㄥ眬鍙橀噺杩愮敤闂璇﹁В_PHP鏁欑▼

PHP unset鍏ㄥ眬鍙橀噺杩愮敤闂璇﹁В_PHP鏁欑▼ | 甯涔嬪

php中文网

发布： 2016-07-15 13:34:21

原创

1483人浏览过

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"><</span> ?PHP  </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> = &lsquo;bar&rsquo;;  </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>

登录后复制

杩斿洖鐨勭粨鏋滀负

PHP多文件上传插件

149

查看详情

bar

立即学习“PHP免费学习笔记（深入）”；

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"><</span> ?PHP  </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> = &ldquo;something&rdquo;;  </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>

登录后复制