如何在PHP中创建基于值的数组？

我有一个这样的数组

  Array
(
    [0] => 123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-31).pdf
    [1] => 123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-30).pdf
    [2] => 123_bms_for__on__(10-06-2015_18-36).pdf
)

我想根据它的值将其转换为多维数组，例如 作为

---

基于第一个下划线（bms、dr）后面的名称，如。。。。。。。请帮助我实现这一目标

我将执行以下操作：

$newArray = array();
foreach ($array as $key => $value) {
    $parts = explode('_', $value);
    $newArray[$parts[1]][] = $value;
}

print_r($newArray); 

---

请根据您的要求查找以下代码

<?php
$array = array(
    '0'=>'123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-31).pdf',
    '1'=>'123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-30).pdf',
    '2'=>'123_bms_for__on__(10-06-2015_18-36).pdf'
);

$dr_array = array();
$bms_array = array();
foreach($array as $val){
    $str_explode = explode("_",$val);

    if($str_explode[1]=="dr"){
        $dr_array[] = $val;
    }
    else if($str_explode[1]=="bms"){
        $bms_array[] = $val;
    }
}
var_dump($dr_array);
var_dump($bms_array);
?>

谢谢。

$basicArray=array（）//它存储所有元素
$basicArray = array(); //It Stores All The Elements
$firstArray = array(); //It will store array elements of first type
$secondArray = array(); //It will store array elements of second type
for($i = 0; $i < count($basicArray); $i++)
{
    $elementArray = explode("_", $basicArray[i]);
    if($elementArray[1] == "dr")
        array_push($firstArray, $basicArray[i]);
    else if($elementArray[1] == "bms")
        array_push($secondArray, $basicArray[i]);
}
$finalArray = array(); 
array_push($finalArray, $firstArray, $secondArray);

$firstArray=array（）//它将存储第一种类型的数组元素
$secondArray=array（）//它将存储第二种类型的数组元素
对于（$i=0；$i

要解决这个问题，不需要循环，最好将函数与内置阵列过滤器函数一起使用

这里有另一个可能的解决方案——我想这似乎有点酷

<?php

// ####################
// GLOBAL VARIABLES DEFINITION    
// ####################
// Store Pattern Here = Used to Define Array at the end
global $Array_IDs; 
$Array_IDs = array();
// Store Variables With Header Pattern (ID) in this area
global $Array_Values; 
$Array_Values = array();

// ####################
// FUNCTION DEFINITION
// ####################
// FUNCTION TO SPLIT ARRAY
function Get_ID($variable){
    // ACCESS GLOBALS
    global $Array_IDs; 
    global $Array_Values; 

    // GET CURRENT VARIBALE - EXPLODE TO EXTRACT PATTERN AS ID
    $Temp_Parts = explode("_", $variable);

    // CHECK IF IDENTIFIER IS ALREADY FOUND (STORED IN ARRAY_ID)
    if (in_array($Temp_Parts[1], $Array_IDs)){
        // ID ALREADY HAS SUB-ARRAY CREATED
        // JUST APPEND VARIABLE
        $Array_Values[$Temp_Parts[1]][] = $variable;
    }else{
        // ADD ID TO Array_IDs
        $Array_IDs[] = $Temp_Parts[1];
        // Create New ARRAY with HEADER AS PATTERN - ID
        $Array_Values[$Temp_Parts[1]][] = $variable;
    }
}

// ####################
// CODE STARTS HERE == ONLY THREE LINES ;)
// ####################
$Start_Array = array('123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-31).pdf','123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-30).pdf','123_bms_for__on__(10-06-2015_18-36).pdf');
array_filter($Start_Array,"Get_ID");
print_r($Array_Values);

?>

---

您可以使用
array\u reduce
函数和正则表达式匹配，以获得优雅而简洁的代码

$array = array(
    '0'=>'123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-31).pdf',
    '1'=>'123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-30).pdf',
    '2'=>'123_bms_for__on__(10-06-2015_18-36).pdf'
);

$result = array_reduce($array, function($prod, $current){
    preg_match('/(?<=^123_)\w+(?=_for\w+)/',$current,$match);
    $prod[$match[0]][] = $current;
    return $prod;
}, []);

使用上面的方括号要求PHP 5.4，您可以用
array（）
替换PHP的较低版本。
模式将始终相同？不仅是bms和dr。。。。。为什么需要两个阵列？OP说dr bms etc可以扩展到任何东西，你想继续扩展if语句吗？OP说dr bms etc可以是任何东西。
<?php

// ####################
// GLOBAL VARIABLES DEFINITION    
// ####################
// Store Pattern Here = Used to Define Array at the end
global $Array_IDs; 
$Array_IDs = array();
// Store Variables With Header Pattern (ID) in this area
global $Array_Values; 
$Array_Values = array();

// ####################
// FUNCTION DEFINITION
// ####################
// FUNCTION TO SPLIT ARRAY
function Get_ID($variable){
    // ACCESS GLOBALS
    global $Array_IDs; 
    global $Array_Values; 

    // GET CURRENT VARIBALE - EXPLODE TO EXTRACT PATTERN AS ID
    $Temp_Parts = explode("_", $variable);

    // CHECK IF IDENTIFIER IS ALREADY FOUND (STORED IN ARRAY_ID)
    if (in_array($Temp_Parts[1], $Array_IDs)){
        // ID ALREADY HAS SUB-ARRAY CREATED
        // JUST APPEND VARIABLE
        $Array_Values[$Temp_Parts[1]][] = $variable;
    }else{
        // ADD ID TO Array_IDs
        $Array_IDs[] = $Temp_Parts[1];
        // Create New ARRAY with HEADER AS PATTERN - ID
        $Array_Values[$Temp_Parts[1]][] = $variable;
    }
}

// ####################
// CODE STARTS HERE == ONLY THREE LINES ;)
// ####################
$Start_Array = array('123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-31).pdf','123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-30).pdf','123_bms_for__on__(10-06-2015_18-36).pdf');
array_filter($Start_Array,"Get_ID");
print_r($Array_Values);

?>

$array = array(
    '0'=>'123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-31).pdf',
    '1'=>'123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-30).pdf',
    '2'=>'123_bms_for__on__(10-06-2015_18-36).pdf'
);

$result = array_reduce($array, function($prod, $current){
    preg_match('/(?<=^123_)\w+(?=_for\w+)/',$current,$match);
    $prod[$match[0]][] = $current;
    return $prod;
}, []);

array(2) {
  [0]=>
  string(57) "123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-31).pdf"
  [1]=>
  string(57) "123_dr_for_ma_on_2352015_2nd Shift_(08-29-2015_11-30).pdf"
}
array(1) {
  [0]=>
  string(39) "123_bms_for__on__(10-06-2015_18-36).pdf"
}