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run code in 300+ PHP versions simultaneously
<?php $first = []; for ($i = 1; $i <= 1000; $i++) { $str = (string)$i; $first[$str[0]]++; } var_dump($first);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key 1 in /in/r6S0V on line 8 Warning: Undefined array key 2 in /in/r6S0V on line 8 Warning: Undefined array key 3 in /in/r6S0V on line 8 Warning: Undefined array key 4 in /in/r6S0V on line 8 Warning: Undefined array key 5 in /in/r6S0V on line 8 Warning: Undefined array key 6 in /in/r6S0V on line 8 Warning: Undefined array key 7 in /in/r6S0V on line 8 Warning: Undefined array key 8 in /in/r6S0V on line 8 Warning: Undefined array key 9 in /in/r6S0V on line 8 array(9) { [1]=> int(112) [2]=> int(111) [3]=> int(111) [4]=> int(111) [5]=> int(111) [6]=> int(111) [7]=> int(111) [8]=> int(111) [9]=> int(111) }

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