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copied!<p>There is a very simple way to do this, based on <a href="http://php.net/preg_replace" rel="nofollow noreferrer"><code>preg_replace</code><sup><em>Doc</em></sup></a> and <a href="http://php.net/stripcslashes" rel="nofollow noreferrer"><code>stripcslashes</code></a>, both build in:</p> <pre><code>preg_replace( '/\\\\([nrtvf\\\\$"]|[0-7]{1,3}|\x[0-9A-Fa-f]{1,2})/e', 'stripcslashes("$0")', $content ); </code></pre> <p>This works as long as <code>"\\n"</code> should become <code>"\n"</code> and the like. <a href="http://codepad.org/FGtxSlX3" rel="nofollow noreferrer">Demo</a>.</p> <p>If you're looking for processing these strings literally, see my <a href="https://stackoverflow.com/a/8311920/367456">previous answer</a>.</p> <p><strong>Edit:</strong> You asked in a comment:</p> <blockquote> <p>I'm just a bit puzzled what's the difference between the output of this and stripcslashes() directly [?]</p> </blockquote> <p>The difference is not always visible, but there is one: <code>stripcslashes</code> will remove the <code>\</code> chracter if no escape sequence follows. In PHP strings, the slash is not be dropped in that case. An example, <code>"\d"</code>, <code>d</code> is not a special character, so PHP preserves the slash:</p> <pre><code>$content = '\d'; $content; # \d stripcslashes($content); # d preg_replace(..., $content); # \d </code></pre> <p>That's why <code>preg_replace</code> is useful here, it will only apply the function on those substrings where <code>stripcslashes</code> works as intended: all valid escape sequences.</p>

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