Change value in multidimension associative array PHP

Question

I must be missing something about how PHP arrays are handled. When I execute the following code:

<?php
$ary = array(
  "alpha" => array("A"=>1,"B"=>2,"C"=>3),
  "beta" => array("A"=>7,"B"=>8,"C"=>9)
  );

foreach ($ary as $key => $vals) {
  $vals["B"]=99;
  echo $key."= ".$vals["A"]." ".$vals["B"]." ".$vals["C"]."<br>";
}
echo $ary['alpha']["B"]."<br>";
?>

I get:

alpha= 1 99 3
beta= 7 99 9
2

The change to 99 in each case seems to be lost. What am I doing wrong?

Thank you! I did not realize that foreach was pass by value by default. Makes a lot of sense now. — tko
– tko, Commented Sep 4, 2016 at 11:13

Andrej · Accepted Answer · 2016-09-03 20:34:32Z

1

If you want to change items of array in foreach statement you should pass by reference.

foreach ($ary as $key => &$vals) {
}

answered Sep 3, 2016 at 20:34

Andrej

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shadab.tughlaq · Accepted Answer · 2016-09-03 20:34:15Z

0

<?php
$ary = array(
  "alpha" => array("A"=>1,"B"=>2,"C"=>3),
  "beta" => array("A"=>7,"B"=>8,"C"=>9)
  );

foreach ($ary as $key => $vals) {
  //$vals["B"]= 99;
  $ary[$key]["B"] = 99;
  echo $key."= ".$vals["A"]." ".$vals["B"]." ".$vals["C"]."<br>";
}
echo $ary['alpha']["B"]."<br>";
?>

answered Sep 3, 2016 at 20:34

shadab.tughlaq

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