PHP - 在句子的两个位置之间搜索和替换

Question

I'm trying to replace 'he' by 'she' between two given positions, in this case between Maria(0) and Peter(34). So basically I give two positions and replace all the occurrences in the sentence between the boundaries. I have tried with the following simple code but it seems that the substr_replace function doesn't allow me to do it. Any idea to make it works?

$sentence = "Maria went to London where he met Peter with his family.";
$clean = substr_replace($sentence, "he", "she", 0, 34);

Answer 1

You are using substr_replace() incorrectly, and in this case you don't need it. Instead, try this, using a combo of str_replace() and substr():

$sentence = "Maria went to London where he met Peter with his family.";
$clean = str_replace(' he ', ' she ', substr($sentence, 0, 34));
$clean .= substr($sentence, 34);

See demo

Essentially, you are replacing he with she on the specified substr of $sentence, then concatenating the rest of $sentence back on.

Note the spaces around ' he ' and ' she '. This is necessary because otherwise you would replace where with wshere.