PHP 数组在函数外部为空 - PHP array empty outside of function

PHP array empty outside of function

本文关键字：外部函数数组 PHP | 更新日期: 2024-04-23

<?php
echo '<pre>';
error_reporting(E_ALL);
$pid = '129';
$families = array
(
      "Griffin"=>array
                      (
                      "PTY"=>"Peter",
                      "STY"=>"X",
                      "QTY"=>"A|F"
                      ),
      "Quagmire"=>array
                      (
                      "NTY"=>"Glenn"
                      ),
      "Brown"=>array
                  (
                  "FTY"=>"Cleveland",
                  "OTY"=>"Q|G|T|Y",
                  "PTY"=>"Junior"
                  )
);
global $allid;
$allid = array();
function buildid($pid,$key,$val){
    if (preg_match("/'|/",$val)){
        $val = explode("|",$val);
            foreach($val as $val1){
                $id = $pid.'-'.$key.'-'.$val1;
                $allid[] = $id;
            }
    }
}
print_r($allid);  
foreach($families as $familieskey=>$familiesvalue){
    foreach($familiesvalue as $skey=>$sval){
        buildid($pid,$skey,$sval);
    }
}
echo '</pre>';
?>

上述代码的预期输出：

案例1：

   Array
    (
        [0] => 129-QTY-A
        [1] => 129-QTY-F
    )
    Array
    (
        [0] => 129-OTY-Q
        [1] => 129-OTY-G
        [2] => 129-OTY-T
        [3] => 129-OTY-Y
    )

案例2：

 Array
    (
      [0] => 129-QTY-A
      [1] => 129-QTY-F
      [2] => 129-OTY-Q
      [3] => 129-OTY-G
      [4] => 129-OTY-T
      [5] => 129-OTY-Y
    )

global $allid;进入函数本身，而不是外部，即

   function buildid($pid,$key,$val){
        global $allid;
        if (preg_match("/'|/",$val)){
    ...

文件指出，

在函数外部使用 global 关键字不是错误。如果文件包含在函数内部，则可以使用它。

-> 除非你从函数内部包含它，否则它不起作用。

编辑以添加：您还需要在运行代码后放置print_r(即在echo '</pre>';之前( - 目前，您在初始化数组后立即显示数组的内容，然后用数据填充它，然后您的程序结束。

您在设置数组值之前输出数组。所以代码应该是这样的。你的函数 buildid(( 是定义的，但在输出数组之前没有被调用。所以print_r($allid(;应该在 foreach 循环中填充其值后调用。

<?php
echo '<pre>';
error_reporting(E_ALL);
$pid = '129';
$families = array
(
    "Griffin"=>array
    (
        "PTY"=>"Peter",
        "STY"=>"X",
        "QTY"=>"A|F"
    ),
    "Quagmire"=>array
    (
        "NTY"=>"Glenn"
    ),
    "Brown"=>array
    (
        "FTY"=>"Cleveland",
        "OTY"=>"Q|G|T|Y",
        "PTY"=>"Junior"
    )
);
$allid = array();
function buildid($pid,$key,$val){
     //Global should be inside function like this.
    global $allid;
    if (preg_match("/'|/",$val)){
        $val = explode("|",$val);
        foreach($val as $val1){
            $id = $pid.'-'.$key.'-'.$val1;
            $allid[] = $id;
        }
    }
}
foreach($families as $familieskey=>$familiesvalue){
    foreach($familiesvalue as $skey=>$sval){
        buildid($pid,$skey,$sval);
    }
}
print_r($allid);
echo '</pre>';
?>

首先。在将数据设置到此数组之前，您可以先进行print_r($allid)。你只在"foreach($families as $familieskey=>$familiesvalue){..."中做到了。

第二，完成。

尝试

error_reporting(E_ALL);
$pid = '129';
$families = array
(
      "Griffin"=>array
                      (
                      "PTY"=>"Peter",
                      "STY"=>"X",
                      "QTY"=>"A|F"
                      ),
      "Quagmire"=>array
                      (
                      "NTY"=>"Glenn"
                      ),
      "Brown"=>array
                  (
                  "FTY"=>"Cleveland",
                  "OTY"=>"Q|G|T|Y",
                  "PTY"=>"Junior"
                  )
);

function buildid($pid,$key,$val){
 global $allid;
    if (preg_match("/'|/",$val)){
        $val = explode("|",$val);
            foreach($val as $val1){
                $id = $pid.'-'.$key.'-'.$val1;
                $allid[] = $id;
            }
    }
}

foreach($families as $familieskey=>$familiesvalue){
    foreach($familiesvalue as $skey=>$sval){
        buildid($pid,$skey,$sval);
    }
}

print_r($allid);