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POWeird behavior using IF statement in PHP
 

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    <p>I am noticing some weird behavior in my script, not sure why its occurring though.</p> <pre><code>if ($date != 'NOW()' || $date != 'NULL') { // throw error } else { // run functions } </code></pre> <p>I have a IF statement similar to the above in one of my functions, i pass the value <code>'NULL'</code> from my function which it is receiving fine. But when doing the comparison with the IF statement, it doesn't work. Its always skipping to else statement.</p> <p><strong>UPDATE:</strong><br> Below is the complete code for my function, i hope it helps.</p> <pre><code>public function setLastLoginDate( $date ) { if (isset($date) &amp;&amp; !empty($date)) { if ($date != 'NOW()' || $date != 'NULL' || is_datetime(convertDateTimeToSql($date)) == false) { $this-&gt;errors['user_last_login'] = 'invalid date specified.'; } else { this-&gt;properties['user_last_login'] = $date; } } } </code></pre> <p><strong>LAST UPDATE</strong><br> Using &amp;&amp; does work instead of ||, but i never intended to use &amp;&amp;. if thats the way it is suppose to be then i guess i have to reRead about that.</p> <p>Isn't &amp;&amp; to check if two variables return true? like <code>if (is_string($foo) &amp;&amp; strlen($foo) &gt; 1)</code> ? but i want to check if the variable contains either of the values</p> <p>But this also does the trick for me:</p> <pre><code>if ( $date == 'NOW()' || $date == 'NULL' || is_datetime(convertDateTimeToSql($date)) == true ) { $this-&gt;properties['user_last_login'] = $date; } else { $this-&gt;errors['user_last_login'] = 'invalid date specified.'; } </code></pre> <p>Did some testing and its working as i want it to with the above. <strong>Is there something wrong using it as above?</strong></p> <p>Thanks</p>
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    1. COI am basically assigning a string here, and comparing it to a string. This has to work but not sure why. I am checking if the date variable is a string with the value `'NOW()'`, i pass this value from my script when i know it is needed. What it should do is assign the variable the value `'NOW()'` i later run a prepare function, when it assigns a value for the db field `date` it sends the mysql function `'NOW()'` to it.
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    2. CObtw, i have similar behavior in another function. But that one is working fine for some unknown reason.
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    3. COupdated with more code to better explain.
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