php – 尝试用相同的搜索字符替换部分字符串

我正在尝试更换部分字符串.但是当我的搜索字符串以相同的字符开头时遇到了问题：

$string = "Good one :y. Keep going :y2"; 

$str = str_replace(array_keys($my_array), array_values($my_array), $string);   
$my_array= array(":y" => "a", ":y2" => "b");

输出继电器：

Good one a. Keep going a2

我需要我的str_replace()来正确/完全匹配单词.

解决方法:

除此之外,您应该在使用之前先定义数组,这应该适合您：

$str = strtr($string, $my_array);

你的问题是str_replace()遍历整个字符串并替换它所能做的一切,你也可以在手册中看到这一点.

从那里引用：

Because str_replace() replaces left to right, it might replace a previously inserted value when doing multiple replacements. See also the examples in this document.

所以为此我在这里使用了strtr(),因为它首先尝试匹配搜索中的最长字节.

您也可以在手册中阅读此内容并从那里引用：

If given two arguments, the second should be an array in the form array(‘from’ => ‘to’, …). The return value is a string where all the occurrences of the array keys have been replaced by the corresponding values. The longest keys will be tried first. Once a substring has been replaced, its new value will not be searched again.

标签：str-replace,php,regex
来源： https://codeday.me/bug/20190925/1816804.html