[英]use preg_replace to replace whole words using associative array
I have this replacement array named $initialdata
: 我有一个名为$initialdata
替换数组:
array ($initialdata)
'd' => string '1.40' (length=4)
'a' => string '1.67' (length=4)
'vi' => string '0' (length=1)
't' => string '?' (length=1)
Then I have this string : 然后我有这个字符串:
$str = "-(vi + sqrt(2*a*d + vi^2))/a)";
When I do : 当我做 :
str_replace(array_keys($initialdata),array_values($initialdata),$str);
I Get : 我得到:
-(0 + sqr?(2*1.67*1.40 + 0^2))/1.67)
What happened was that the "t" of the "sqrt" was replaced by the value of "t" on my $initialdata
array. 发生的事情是“sqrt”的“t”被我的$initialdata
数组中的“t”值所取代。 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. 我知道发生这种情况是因为我正在使用str_replace
,我需要使用preg_replace
来匹配整个单词,但是我从未看到使用关联数组来匹配任何整个单词的preg_replace
任何实现。 How can this be achieved if possible? 如果可能,如何实现?
In regex, \\b
are the word boundaries. 在正则表达式中, \\b
是单词边界。 This should work: 这应该工作:
$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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