为什么 str_replace 没有正确替换

Question

这是我的脚本

$searchArray = array("Coupon Codes", "Coupon Code", "Promo", "Promo Codes");

$replaceArray = array("Promo Code", "Promo Codes", "Coupons", "Coupon Code");

$intoString = "Best Buy Coupon Codes";

print str_replace($searchArray, $replaceArray, $intoString);

结果：百思买优惠券代码

预期输出：百思买促销代码

PHP 版本 5.6.36

Answer 1

截至： http://php.net/manual/en/function.str-replace.php

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.

事情是这样的：

Best Buy 优惠券代码 -> Best Buy 促销代码（第一对） -> Best Buy 优惠券代码（第三对）

更改 $searchArray（和 $replaceArray），使下一个示例不包含之前的示例（即从最短字符串到最长字符串）

Answer 2

出现意外结果的原因是 str_replace will first replace "Coupon Codes" with "Promo Code" and then it will later substitute "Promo" with "Coupons". To work around this, use the array form of strtr，它将首先处理最长的字符串，但最重要的是不会替换到任何先前替换的文本中。例如

$searchArray = array("Coupon Codes", "Coupon Code", "Promo", "Promo Codes");
$replaceArray = array("Promo Code", "Promo Codes", "Coupons", "Coupon Code");
$intoString = "Best Buy Coupon Codes";

// this doesn't work
echo str_replace($searchArray, $replaceArray, $intoString);
// this does
echo strtr($intoString, array_combine($searchArray, $replaceArray));

输出：

Best Buy Coupons Code
Best Buy Promo Code

为什么 str_replace 没有正确替换

Why str_replace is not replacing correctly

php

str-replace