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    <p>Please correct me if i wrong, but from your code above, when you eval you $condition string, you put it back again into $condition. Unless your evaluated code have "return" in it, it will return null ( reff : <a href="http://php.net/manual/en/function.eval.php" rel="nofollow">http://php.net/manual/en/function.eval.php</a>).</p> <p>But your problem is actually miss-use of " on $condition. When you use " to wrap string(s) on php, it will change every variable on that string to the value defined for that variable above that code.</p> <p>So, instead having your code evaluate by php, you're actually sending wrong code to eval().</p> <p>your current $condition code is :</p> <pre><code>if(HD&lt;&gt;'99' &amp;&amp; HD&lt;&gt;'XX' &amp;&amp; HD&lt;&gt;'XM' &amp;&amp; HD&lt;&gt; 'XD' &amp;&amp; HD&lt;&gt; 'XY' &amp;&amp; HD&lt;&gt; 'XE') { echo 'YES'; } else { echo 'NO'; } </code></pre> <p>and what you're trying to achive is :</p> <pre><code>if($status&lt;&gt;"99" &amp;&amp; $status&lt;&gt;"XX" &amp;&amp; $status&lt;&gt;"XM" &amp;&amp; $status&lt;&gt; "XD" &amp;&amp; $status&lt;&gt; "XY" &amp;&amp; $status&lt;&gt; "XE") { echo "YES"; } else { echo "NO"; } </code></pre> <p>Please change " to ' since string(s) wrap in ' will be as it is (if you want to put ' inside it, please escaped it using backslash (\) ) and see what happen.</p> <p>my work around :</p> <pre><code>$status = "HD"; $vari = "XX"; $condition = 'if($status&lt;&gt;"99" &amp;&amp; $status&lt;&gt;"XX" &amp;&amp; $status&lt;&gt;"XM" &amp;&amp; $status&lt;&gt; "XD" &amp;&amp; $status&lt;&gt; "XY" &amp;&amp; $status&lt;&gt; "XE") { echo "YES"; } else { echo "NO"; }'; eval($condition ); echo $condition; echo "&lt;hr&gt;"; $resp = str_replace('status','vari',$condition); eval($resp); </code></pre>
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    1. POchange variables using str_replace on eval
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    1. USMoch. Rasyid
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    1. POchange variables using str_replace on eval
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    1. CO@Mock. Rasyd, Thank you, your two results were great
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    2. COanytime, but what is "my two results" ?? anyway, please look another way before using eval like the other(s) comment(s) above. I'd rather generate a new php file using "while.." and then redirect user to execute that php file.
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    3. COcan i use as result an $variable = 'yes' or false $variable = 'no' instead echo 'yes' echo 'no' ?
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