Online PHP editor | refs for fL9aH

<?php $css=<<<CSS p.special { font: 12pt/14pt sans-serif; margin: 5px 0px 2px 25px; border: medium dashed #ff0000; background: white url( http://www.foo.com/image.gif ) repeat-x fixed top right; } /************************************************* Save with a name ending in .css such as styles.css *************************************************/ h1 { color: red; padding: 10px; text-decoration: underline; } .code_sample ul { list-style-type: upper-roman; /* LEAVE THIS BIT OUT */ margin-left: 50px; } .code_sample p { color: darkblue } a:link, a:visited, a:hover, a:active { background-color: green; color: white; padding: 10px 25px; text-align: center; text-decoration: none; display: inline-block; } CSS; $patterns=[ '~\s+~', // reduce one or more consecutive whitespace characters ([\n\r \t]+) to a single space ...this combines the 2nd, 3rd, and 4th pattern from catchamonkey's answer '~/\s*\*.*?\*/\s*|(?:(?<=[,:;{}(]) | (?=[,:;{})]))|;(?=})|^ | $~s' // comment blocks, leading/trailing spaces after ,:;{} characters, space before ), space after (, semicolon followed by }, whitespace at start/end of file ]; $replacements=[ ' ', '' ]; // And here's a rabbit hole: https://regex101.com/r/nZbHND/1 var_export(preg_replace($patterns,$replacements,$css));