基于键或数据的PHP查找

$array = array(\'1\'=>\'A\',\'2\'=>\'B\',\'3\'=>\'C\');

//Use the key to get the value
echo $array[\'1\'] //Echos A
echo $array[\'2\'] //Echos B
echo $array[\'3\'] //Echos C

//Use the value to get the key
echo array_search(\'A\',$array) //Echos 1
echo array_search(\'B\',$array) //Echos 2
echo array_search(\'C\',$array) //Echos 3

$myArray = array(\'key1\' => \'var\',\'key2\' => \'test\');
$data = \'test\';
foreach ($myArray as $key => $value) {
    if ($value == $data) {
        echo \'Found it - \' . $key;
    }
}

<?php $arr = array(\"1\" => \"A\", \"2\" => \"B\", \"3\" => \"C\"); ?>