$line = "Hello World";
$line= preg_replace("/Hello/", $replacement, $line); - Works!
$find = "Hello";
$line= preg_replace("/$find/", $replacement, $line); - Wont replace anything!
$string = "Hello";
$find = "/".$string."/";
$line= preg_replace($find, $replacement, $line); - Wont replace anything!
我如何使用一个变量来说明:preg_replace()哪些东西可以找到?
如果你在字面上使用“Hello World”,那么例子就应当全部奏效,如果它们会错的话,那将是真的奇怪的。
如果你使用不同的特质,则在使用这些指示之前,可以肯定操作。
错误应当发生在其他地方。 下面的文字做的是罚款:
<?php
$line = "Hello World";
$replacement = "Bye";
$string = "Hello";
$find = "/".$string."/";
print_r( preg_replace($find, $replacement, $line) );
## output: Bye World
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