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<?php echo count( array_intersect( array_count_values( str_split('abclkjabc'), ), [1] ) );
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1
3
Output for 7.2.0 - 7.2.33
Parse error: syntax error, unexpected ')' in /in/t0CnY on line 7
Process exited with code 255.
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49.17 ms | 406 KiB | 5 Q