找到所有特定詞的位置

Question

以下是我在php代碼中的要求。

$Arr = array(); 
$Arr = ('JDF1','JDF2','UDF1','JDF3','UDF3'); 

我想知道所有JDFs和UDFs的具體位置。

比方說說JDFs位於1st,2nd and 4th的位置，UDFs位於3rd and 5th的位置。那麼我也應該得到匹配的值。

例子：

At 4th position I have JDF3 like that. 

Answer 1

嘗試使用array_key_exists和array_flip等作爲

$Arr = ['JDF1','JDF2','UDF1','JDF3','UDF3']; 
$find = 'JDF3'; 
$search = array_flip($Arr); 
echo array_key_exists($find,$search) ? "The $find is at ".($search[$find] + 1)." position" : "We can't find $find within your table"; 

輸出：

The JDF3 is at 4 position 

Answer 2

你需要像這樣選擇搜索參數使用array_keys功能。

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

有關詳細信息，請參閱本，http://php.net/manual/en/function.array-keys.php

Answer 3

嘗試使用foreach爲

<?php 
 
    $Arr = ('JDF1','JDF2','UDF1','JDF3','UDF3'); 
 
    //initialization ;) 
 
    $i = 0; 
 
    
 
    foreach ($Arr as $key) { 
 
     $i ++; 
 

 
     echo "At position {$i} I have Key {$key}.<br />"; 
 
    } 
 

 
?>