Question

如何通过此数组中的特定键获取所有值？

Array ( 
[0] => Array ( [0] => Key1 [1] => Value1 ) 
[1] => Array ( [0] => Key1 [1] => Value2 ) 
[2] => Array ( [0] => Key2 [1] => Value12 ) 
)

exp。：使用Key1获取这些值：Value1，Value2

已经尝试过：

$values = array_column($param, 'Key1');
print_r($values);
//empty array

Answer 1

您可以使用B

array_reduce

这将导致：

$arr = array ( 
    array ( 'Key1', 'Value1' ), 
    array ( 'Key1', 'Value2' ), 
    array ( 'Key2', 'Value12' ),
);

$search = "Key1"; /* Update this to use */

$result = array_reduce($arr, function( $c, $v ) use ( $search ) {
    if ( $v[0] == $search ) $c[] = $v[1];
    return $c;
}, array());

Doc：http://php.net/manual/en/function.array-reduce.php

Answer 2

您可以尝试这样的事情：

<?php
    $yourArray = Array( 
        0 => Array ( 0 => 'Key1', 1 => 'Value1' ), 
        1 => Array ( 0 => 'Key1', 1 => 'Value2' ), 
        2 => Array ( 0 => 'Key2', 1 => 'Value12' ) 
    );
    $desired_text = 'key1'; //your desired matching key
    $values = array();  //variable to store captured data
    foreach($yourArray as $innerarray)
    {
        //check if the first index has your desired text
        if(strtolower($innerarray[0]) == $desired_text ) //converting to lower case and matching
        {
            $values[] = "{$innerarray[1]}"; //then grab the value
        }
    }
    if(isset($values))
        print_r($values);   //show the values you've grabbed
?>

输出结果为：Array ( [0] => Value1 [1] => Value2 )

PHP - 通过特定键从数组中获取值

2 个答案: