Regex replace keyword with different string by loop (PHP)

Question

Let say I have a string

$content = "hello . wow . cool . yes!";

It's easy to just replace the dot to another string:

echo preg_replace("/\./", "<img>", $content);

so the output is:

hello <img> wow <img> cool <img> yes!

however, is there any way to replace it one by one?

for example, I have an array and would like to insert them into the string.

$arr = ['<img src="a"/>', '<img src="b"/>', '<img src="c"/>'];

the expected output:

hello <img src="a"/> wow <img src="b"/> cool <img src="c"/> yes!

I can use preg_match_all to get the separator but still have no idea how to replace it respectively.

Thank you for any help.

Alexander Mashin · Accepted Answer · 2020-10-16 05:23:27Z

1

Use preg_replace_callback. Store the number of the current full stop in a static variable. Access $arr from the callback with use (). Use modulo in case there are not enough items in $arr.

<?php
$content = 'hello . wow . cool . yes!';
$arr = ['<img src="a"/>', '<img src="b"/>', '<img src="c"/>'];
$content = preg_replace_callback ('/\./', function ($_) use ($arr) {
    static $count = 0;
    return $arr [$count++ % count ($arr)];
}, $content);
echo ($content);

http://sandbox.onlinephpfunctions.com/code/f9115bdb6eb17e30012d987ed1fc4b95e7c10d33.

edited Oct 16, 2020 at 5:23

answered Oct 16, 2020 at 5:17

Alexander Mashin

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