<?php $foo = [ 'a' => '1', 'b' => '1', 'c' => '2', ]; $foo2 = array_combine(array_keys($foo), array_keys($foo)); var_dump($foo2); $foo3 = array_map(function($v) { return '#' . $v; }, $foo2); var_dump($foo3); $foo4 = array_combine($foo3, $foo); var_dump($foo4);
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