php - 在数组中查找各种值？

Question

我想在数组中找到几个值中的任何一个的第一次出现。

$sentence = array(I, want, to, go, to, the, market);
if(in_array(array('swim','fly','go'), $sentence)) {
    // Should return KEY = 3 as 'go' was found in the third key of the array
    }

我敢肯定这一定很常见，怎么办？

Answer 1

http://tr.php.net/manual/en/function.array-keys.php

我想更具体地说，您正在寻找这种类型的功能？

<?php
$array = array(0 => 100, "color" => "red");
print_r(array_keys($array));

$array = array("blue", "red", "green", "blue", "blue");
print_r(array_keys($array, "blue"));

$array = array("color" => array("blue", "red", "green"),
               "size"  => array("small", "medium", "large"));
print_r(array_keys($array));
?>

上面的示例将输出：

Array
(
    [0] => 0
    [1] => color
)
Array
(
    [0] => 0
    [1] => 3
    [2] => 4
)
Array
(
    [0] => color
    [1] => size
)

Answer 2

请使用此函数array_search如果在数组中找到元素，它将返回元素的键

例子

$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

$key = array_search('green', $array); // $key = 2;
$key = array_search('red', $array);   // $key = 1;

Answer 3

首先你应该正确阅读 in_array 函数的手册，你以错误的顺序传递参数

$sentence = array(I, want, to, go, to, the, market);

 $found_key = array();   
 foreach($sentence as $key => $word)
    {
      if(in_array($word,array('swim','fly','go')))  
       { $found_keys[] = $key;}
    }
   print_r($found_keys);

我希望这是你需要的

Answer 4

array_keys 会很有效。

$keys = array_keys($sentence,array('swim','fly','go');

然后 $keys 将是一个在 $sentence 中游泳、飞行和去的键的列表

就像下面的代码将返回具有空值的键列表

$array = array('one','','three');
$keys = array_keys($array,"");

Answer 5

function find_in_array($needles,$array) {
    $pos = false;
    foreach ($needles as $key => $value) {
        if (in_array($value, $array)) {
            if(!$pos || array_search($value, $array) < $pos) {
                $pos = array_search($value, $array);
                }
            }
        }
        return $pos;
    }

echo find_in_array($values,$sentence);

This is what I am using right now, I'm testing array_keys as suggested by Darian Brown