PHP删除数组中指定值的元素

<?php

function deleteByValue1($arr, $value)
{
    if (!is_array($arr)) {
        return $arr;
    }
    foreach($arr as $k=>$v) {
        /**
         * foreach遍历，删除数组中指定值的元素
         */
        if ($v == $value) {
            unset($arr[$k]);
        }
    }
    return $arr;
}

function deleteByValue2($arr, $value)
{
    // 使用array_flip()函数反转/交换数组中的键名和对应关联的键值
    $temp = array_flip($arr);
    // 删除键名值为指定值的元素
    unset($temp[$value]);
    return array_flip($temp);
}

function deleteByValue3($arr, $value)
{
    // array_search() 函数在数组中搜索某个键值，并返回对应的键名
    $key = array_search($value, $arr);
    if (isset($key)) {
        unset($arr[$key]);
    }
    return $arr;
}

function deleteByValue4($arr, $value) {
    // 返回指定值的所有键名，数组
    $keys = array_keys($arr, $value);
    if (!empty($keys)) {
        foreach($keys as $key) {
            unset($arr[$key]);
        }
    }
    return $arr;
}

$arr = array(
    't' => 'qq',
    'q' => 'qq',
    'b' => 'baidu',
    'a' => 'ali',
    'm' => 'xiaomi'
);
$arr1 = $arr2 = $arr3 = $arr4 = $arr;

$test1 = deleteByValue1($arr1, 'baidu');
print_r($test1);
/**
Array
(
    [t] => qq
    [q] => qq
    [a] => ali
    [m] => xiaomi
)
 */

$test2 = deleteByValue2($arr2, 'baidu');
print_r($test2);
/**
Array
(
    [q] => qq
    [a] => ali
    [m] => xiaomi
)
 */
$test3 = deleteByValue3($arr3, 'baidu');
print_r($test3);
/**
Array
(
    [t] => qq
    [q] => qq
    [a] => ali
    [m] => xiaomi
)
 */

$test4 = deleteByValue4($arr4, 'baidu');
print_r($test4);
/**
Array
(
    [t] => qq
    [q] => qq
    [a] => ali
    [m] => xiaomi
)
 */

原文链接：
https://www.jb51.net/article/146022.htm