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<?php $array = array( 25 => 1, 26 => 3, 10 => 2, 24 => 1 ); ksort( $array ); var_dump( $array );
Output for 4.3.0 - 7.2.0
array(4) { [10]=> int(2) [24]=> int(1) [25]=> int(1) [26]=> int(3) }