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run code in 300+ PHP versions simultaneously
<?php function seek(&$arr, $key, $strict = false){ $offset = 0; while( $strict ? key($arr) !== $key : key($arr) != $key ){ next($arr); $offset++; } return $offset; } $arr = [ 'a' => 10, 'b' => 11, 'c' => 12, 'd' => 13, 'e' => 14, ]; $offset = seek($arr, 'c'); var_dump($offset); var_dump(key($arr)); var_dump(current($arr));
Output for 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
int(2) string(1) "c" int(12)

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