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<?php function noDuplicates($array) { return !array_unique( array_diff_assoc( $array, array_unique($array) ) ); } var_export(noDuplicates([1, 1.5]));
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.26, 8.0.0 - 8.0.13, 8.1rc1 - rc3
true

preferences:
29.01 ms | 459 KiB | 5 Q