3v4l.org

run code in 300+ PHP versions simultaneously
<?php $key_val1 = [ 101 => 2, 102 => 1, 103 => 3, 104 => 2 ]; $key_val2 = [ 101 => 2, 104 => 2, 103 => 1 ]; foreach ($key_val1 as $key => &$value) { if (array_key_exists($key, $key_val2)) { $value -= $key_val2[$key]; } } unset ($value); print_r($key_val1);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
Array ( [101] => 0 [102] => 1 [103] => 2 [104] => 0 )
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.
preferences:
158.04 ms | 407 KiB | 5 Q