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<?php $source = '<img src="source.jpg">'; $string = '<div id="pf1" class="pf w0 h0" data-page-no="1"> <div class="pc pc1 w0 h0"> <img class="bi x0 y0 w0 h0" alt="" src="../images/cover.jpg"/> </div>'; $find = '/<img(.*?)\/>/'; echo preg_replace($find, $source, $string);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
<div id="pf1" class="pf w0 h0" data-page-no="1"> <div class="pc pc1 w0 h0"> <img src="source.jpg"> </div>

preferences:
146.27 ms | 408 KiB | 5 Q