Here is an example of how to programmatically add a breakpoint based on a condition:<?php$blah = 'meh';if ($blah !== 'blah') { phpdbg_break_file('blah.php', 6);}$blah = 'blah';echo $blah;?>OUTPUT when running the debugger (using ev to evaluate the value of $blah after each step):C:\path\to\dir>phpdbg -e blah.php[Welcome to phpdbg, the interactive PHP debugger, v8.1.6]To get help using phpdbg type "help" and press enter[Please report bugs to <http://bugs.php.net/report.php>][Successful compilation of C:\path\to\dir\blah.php]prompt> run[Breakpoint #0 added at C:\path\to\dir\blah.php:6][Breakpoint #0 at C:\path\to\dir\blah.php:6, hits: 1]>00006: $blah = 'blah'; 00007: echo $blah; 00008: ?>prompt> ev $blahmehprompt> step>00007: echo $blah; 00008: ?>prompt> ev $blahblahprompt> stepblah>00008: ?>prompt> step[Script ended normally]