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run code in 300+ PHP versions simultaneously

@ 2025-05-17T17:52:48Z

<?php
function flup($level=0) {                                                                                                                                       
    $out="nope";                                                                                                                                                
    echo "($level) flup. ($out)\n";                                                                                                                             
    sleep(1);                                                                                                                                                   
    $level++;                                                                                                                                                   
    if($level==2) {                                                                                                                                             
        $out="yep";                                                                                                                                             
        return($out);                                                                                                                                           
    } else {                                                                                                                                                    
        return flup($level);                                                                                                                                           
    }                                                                                                                                                           
}

echo "[".flup()."]\n";

Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: (0) flup. (nope) (1) flup. (nope) [yep]
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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