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run code in 150+ php & hhvm versions
Bugs & Features
<?php // Active assert and make it quiet assert_options(ASSERT_ACTIVE, 1); // Create a handler function function my_assert_handler($file, $line, $code, $desc = null) { echo "Assertion failed at $file:$line: $code"; if ($desc) { echo ": $desc"; } echo "\n"; } // Set up the callback assert_options(ASSERT_CALLBACK, 'my_assert_handler'); // Make an assertion that should fail assert('2 < 1'); assert('2 < 1', 'Two is less than one');
Output for 5.4.8 - 5.6.28, 7.0.0 - 7.1.0
Assertion failed at /in/2PCr8:20: 2 < 1 Warning: assert(): Assertion "2 < 1" failed in /in/2PCr8 on line 20 Assertion failed at /in/2PCr8:21: 2 < 1: Two is less than one Warning: assert(): Two is less than one: "2 < 1" failed in /in/2PCr8 on line 21
Output for hhvm-3.12.0

Process exited with code 137.
Output for hhvm-3.10.0
Assertion failed at /in/2PCr8:20: 2 < 1 Assertion failed at /in/2PCr8:21: 2 < 1
Output for 5.3.0 - 5.4.7
Assertion failed at /in/2PCr8:20: 2 < 1 Warning: assert(): Assertion "2 < 1" failed in /in/2PCr8 on line 20 Warning: assert() expects exactly 1 parameter, 2 given in /in/2PCr8 on line 21
Output for 5.2.3 - 5.2.17
Assertion failed at /in/2PCr8:20: 2 < 1 Warning: assert(): Assertion "2 < 1" failed in /in/2PCr8 on line 20 Warning: Wrong parameter count for assert() in /in/2PCr8 on line 21
Output for 4.4.3 - 5.2.2
Assertion failed at /in/2PCr8:20: 2 < 1 <br /> <b>Warning</b>: assert() [<a href='function.assert'>function.assert</a>]: Assertion &quot;2 &lt; 1&quot; failed in <b>/in/2PCr8</b> on line <b>20</b><br /> <br /> <b>Warning</b>: Wrong parameter count for assert() in <b>/in/2PCr8</b> on line <b>21</b><br />
Output for 4.3.2 - 4.4.2
Assertion failed at /in/2PCr8:20: 2 < 1 <br /> <b>Warning</b>: assert(): Assertion &quot;2 &lt; 1&quot; failed in <b>/in/2PCr8</b> on line <b>20</b><br /> <br /> <b>Warning</b>: Wrong parameter count for assert() in <b>/in/2PCr8</b> on line <b>21</b><br />
Output for 4.3.0 - 4.3.1
Assertion failed at /in/2PCr8:20: 2 < 1 <br /> <b>Warning</b>: assert() [<a href='http://www.php.net/function.assert'>function.assert</a>]: Assertion "2 < 1" failed in <b>/in/2PCr8</b> on line <b>20</b><br /> <br /> <b>Warning</b>: Wrong parameter count for assert() in <b>/in/2PCr8</b> on line <b>21</b><br />