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<?php $embedCode = '<iframe width="800"> </iframe>'; echo preg_replace('/(<iframe[^>]*\swidth=")(\d+)("\s.*)/', '${1}' . $width . '{3}', $embedCode);
based on XeKGv
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: width in /in/ci5lk on line 3 <iframe width="800"> </iframe>
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: width in /in/ci5lk on line 3 <iframe width="800"> </iframe>