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$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!
如何使用变量来告知preg_replace()
要查找什么?preg_replace不考虑变量