如何用数组中的字符串替换子字符串使用preg_replace？ （PHP）

Question

我有包含这些值的数据阵列：

Array 
(
    [id] => 1 
    [myid] => 9 
    [date] => 2014-01-30 
    [user] => 17 
    [reason] => some text here... 
) 

这串包含数字参照数据数组索引：

$columns = '(0) as "id",(1) as "myid",(2) as "date",(3) as "user",(4) as "reason"'; 

是否有可能改变封闭在数字括号，包括括号从数组中取适当的值？

我知道如何与(string) preg_replace((array) $patterns, (array) $replacements, (string) $subject)一起工作，但完全不知道如何解决这个问题。

理想的结果字符串看起来是这样的：

'1' as "id",'9' as "myid",'2014-01-30' as "date",'17' as "user",'some text here...' as "reason" 

Answer 1

使用preg_replace_callback和str_replace功能的解决方案：

$columns = '(0) as "id",(1) as "myid",(2) as "date",(3) as "user",(4) as "reason"'; 

// $arr is your initial array 
$result = preg_replace_callback(
       "/(\(\d\)) as \"(\w+?)\",?/i", 
       function ($maches) use($arr){ 
        return str_replace([$maches[1]], "'". $arr[$maches[2]]. "'", $maches[0]); 
       }, 
       $columns); 

print_r($result); 

输出：

'1' as "id",'9' as "myid",'2014-01-30' as "date",'17' as "user",'some text here...' as "reason" 

Answer 2

只需使用一个循环与str_replace函数。遍历数组，使用括号中的循环索引作为搜索字符串，并将其替换为相应的值。

Answer 3

array_flip是你的救星

直接从文档

<?php 
$input = array("oranges", "apples", "pears"); 
$flipped = array_flip($input); 

print_r($flipped); 
?> 

上面的例子将输出：

Array 
(
    [oranges] => 0 
    [apples] => 1 
    [pears] => 2 
) 

Answer 4

你可以用一个简单的foreach循环做到这一点：

$info = array(
    'id' => 1, 
    'myid' => 9, 
    'date' => '2014-01-30', 
    'user' => 17, 
    'reason' => 'some text here...' 
); 

$columns = '(0) as "id",(1) as "myid",(2) as "date",(3) as "user",(4) as "reason"'; 

foreach (array_values($info) as $key => $value) { 
    $columns = str_replace(
     '(' . $key . ')', 
     str_pad($value, strlen($value) + 2, "'", STR_PAD_BOTH), 
     $columns 
    ); 
} 

echo $columns; 

Answer 5

你可以只用一些PHP库函数做到这一点。

$info = array(
    'id' => 1, 
    'myid' => 9, 
    'date' => '2014-01-30', 
    'user' => 17, 
    'reason' => 'some text here...' 
); 

$columns = '(0) as "id",(1) as "myid",(2) as "date",(3) as "user",(4) as "reason"'; 

$new_Arr = array(); 
$column_arr = explode(",", $columns); 
foreach($column_arr as $values){ 
    $arr = explode(" as ", $values); 
    $new_Arr[] = "'".$info[trim($arr[1], '"')]."' as ".$arr[1]; 
} 

echo implode(",", $new_Arr) //'1' as "id",'9' as "myid",'2014-01-30' as "date",'17' as "user",'some text here...' as "reason"