<?php $value = 2; $array = [1, 2, 3]; array_unshift($array,$value); // prepend a duplicate var_export(array_unique($array)); // kill the original echo "\n---\n"; $value = 2; $array = [1, 2, 3]; var_export(array_unique(array_merge([$value],$array))); // prepend a duplicate, kill the original echo "\n---\n"; $value = 2; $array = [1, 2, 3]; array_unshift($array,$value); // prepend a duplicate var_export(array_keys(array_keys($array))); // kill the original echo "\n---\n"; $value = 2; $array = [1, 2, 3]; var_export(array_keys(array_keys(array_merge([$value],$array)))); // prepend a duplicate, kill the original
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