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<?php $html = "<div><p><br/>Hello World</p><p><br/></p><p> <br> </p></div>"; $doc = new DOMDocument(); $doc->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); $xpath = new DOMXPath($doc); // find <br> within a <p> that has text content $breaks = $xpath->query("//p[normalize-space()!='']/br"); // and remove them foreach ($breaks as $br) { $br->parentNode->removeChild($br); } echo $doc->saveHTML(); $doc->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); $xpath = new DOMXPath($doc); // find <br> within a <p> that has text content $breaks = $xpath->query("//p[text()!='']/br"); // and remove them foreach ($breaks as $br) { $br->parentNode->removeChild($br); } echo $doc->saveHTML();
Output for 5.6.38, 7.1.0 - 7.1.24, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
<div><p>Hello World</p><p><br></p><p> <br> </p></div> <div><p>Hello World</p><p><br></p><p> </p></div>
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 <div><p>Hello World</p><p><br></p><p> <br> </p></div> <div><p>Hello World</p><p><br></p><p> </p></div>

preferences:
128.21 ms | 402 KiB | 177 Q