3v4l.org

run code in 300+ PHP versions simultaneously
<?php $initial_array = Array ( '061716v' => 1, '061610A' => 1, '062433AP' => 1, '063868M' => 2, '059173V' => 3, '061579A' => 3, '062404AP' => 3, '059179V' => 4, '061582A' => 4, '061697V' => 4, '062407AP' => 4 ); $final_array = []; foreach($initial_array as $key=>$val){ $final_array[$val] = isset($final_array[$val]) ? $final_array[$val].','.$key : $key; } print_r($final_array);
Output for 5.6.38, 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 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 - 8.5.1
Array ( [1] => 061716v,061610A,062433AP [2] => 063868M [3] => 059173V,061579A,062404AP [4] => 059179V,061582A,061697V,062407AP )
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:
175.63 ms | 407 KiB | 5 Q