使用preg_replace使用关联数组替换整个单词 [英] use preg_replace to replace whole words using associative array

问题描述

我有一个名为$initialdata的替换数组:

I have this replacement array named $initialdata :

array ($initialdata)
  'd' => string '1.40' (length=4)
  'a' => string '1.67' (length=4)
  'vi' => string '0' (length=1)
  't' => string '?' (length=1)

然后我有这个字符串:

$str =  "-(vi + sqrt(2*a*d + vi^2))/a)";

我这样做时:

str_replace(array_keys($initialdata),array_values($initialdata),$str);

我明白了:

-(0 + sqr?(2*1.67*1.40 + 0^2))/1.67)

发生的是，在我的$initialdata数组上，"sqrt"的"t"被替换为"t"的值.我知道发生这种情况是因为我正在使用str_replace，并且我需要使用preg_replace匹配整个单词，但是我从未见过使用关联数组匹配任何整个单词的preg_replace的任何实现.如果可能的话如何实现?

What happened was that the "t" of the "sqrt" was replaced by the value of "t" on my $initialdata array. I know that this happens because I'm using str_replace, and I need to match whole words using preg_replace, however I never saw any implementation of preg_replace using associative arrays to match any whole word. How can this be achieved if possible?

推荐答案

在正则表达式中，\b是单词边界.这应该起作用:

In regex, \b are the word boundaries. This should work:

$data = array(
  '/d/' => '1.40',
  '/a/' => '1.67',
  '/vi/' => '0',
  '/\bt\b/' => '?'
);

$result = preg_replace(array_keys($data), array_values($data), $str);

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