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<?php $foo = mysql_real_escape_string('no connection'); var_dump($foo);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Fatal error: Uncaught Error: Call to undefined function mysql_real_escape_string() in /in/WUc9K:1 Stack trace: #0 {main} thrown in /in/WUc9K on line 1
Process exited with code 255.
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28
Fatal error: Call to undefined function mysql_real_escape_string() in /in/WUc9K on line 1
Process exited with code 255.

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