PHP array empty outside of function [duplicate] - php

Question

This question already has answers here:
Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?
(3 answers)
Closed 8 years ago.
<?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>';
?>
Expected output for the above code:
Case1:
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
)
Case2:
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
)

Answer 1

The global $allid; goes into the function itself, not outside, i.e.
function buildid($pid,$key,$val){
global $allid;
if (preg_match("/\|/",$val)){
...
The documentation points out that
Using global keyword outside a function is not an error. It can be used if the file is included from inside a function.
--> Unless you do include it from inside a function, it has no effect.
Edit to add: You also need to put the print_r after you run the code (i.e. right before echo '</pre>';) - currently, you are showing the content of the array right after you initialize it, then you fill it with data, and then your program ends.

Answer 2

You are outputting array before setting its value. So code should be like this.
Your function buildid() is defined but not called before outputting array.
so print_r($allid); should be called afters its value are filled in foreach loop.
<?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>';
?>

Answer 3

First. You make print_r($allid) before setting to this array the data. You did it only in "foreach($families as $familieskey=>$familiesvalue){..."]
Second.Done.
TRY
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);