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<?php $arr = ['a','b','c','d']; array_walk($arr, function(&$a) {$a .= '1';}); print_r($arr); $array = array( 1 => "a", "1" => "b", 1.5 => "c", true => "d", ); print_r($array); $a = 1;echo $b=&$a;echo $c='2$b';echo $d='2'.$b;
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