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copied!<p>Given</p> <pre><code>*/30 * * * * php /var/www/html/result.php </code></pre> <p>There are multiple possibilities why it is not working:</p> <p>1) First of all it is important to check if the simple execution of <code>php /var/www/html/result.php</code>. This is required. But unfortunately, accomplishing this does not mean that the problem is solved.</p> <p>2) The path of the <code>php</code> binary has to be added.</p> <pre><code>*/30 * * * * php /var/www/html/result.php </code></pre> <p>to be changed to</p> <pre><code>*/30 * * * * /usr/bin/php /var/www/html/result.php </code></pre> <p>or whatever coming from <code>which php</code>.</p> <p>3) Check the permission of the script to the user running the crontab.</p> <p>Give execution permission to the file: <code>chmod +x file</code>. And make sure the crontab is launched by a user having rights to execute the script. Also check if the user can access the directory in which the file is located.</p> <p>4) To be safer, you can also add the php path in the top of the script, such as:</p> <pre><code>#!/usr/bin/php -q <?php ... ?> </code></pre> <p>5) Make sure the user has rights to use crontab. Check if he is in the <code>/etc/cron.d/deny</code> file. Also, make a basic test to see if it is a crontanb or php problem.</p> <pre><code>* * * * * touch /tmp/hello </code></pre> <p>6) Output the result of the script to a log file, as <a href="https://stackoverflow.com/questions/7397469/why-is-crontab-not-executing-my-php-script/7397498#7397498">William Niu suggested</a>.</p> <pre><code>*/30 * * * * /usr/bin/php /var/www/html/result.php > /tmp/result </code></pre> <p>7) Use the <code>-f</code> option to execute the script:</p> <pre><code>*/30 * * * * /usr/bin/php -f /var/www/html/result.php > /tmp/result </code></pre> <hr> <p><strong>To sum up</strong>, there are many possible reasons. One of them should solve the problem.</p>

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