I'm trying to update an array but the array contains arrays.
For a example,
$data = array(
array('name'=>'John','age'=>'19','alive'=>'false'),
array('name'=>'Bob','age'=>'32','alive'=>'false'),
array('name'=>'Kate','age'=>'22','alive'=>'false'),
);
I need to add another element to all these arrays.
I tried using foreach
foreach($data as $onearray){
$onearray['alive'] = 'true';
}
Do I need to create a new array and add all updated arrays back to new one?
Did you try using the data array key? Like so:
foreach($data as $key => $onearray){
$data[$key]['alive'] = 'true';
}
( Notice the $onearray never gets used )
Even faster would be:
for($i = 0; $i < count($data); $i++) {
$data[$i]['alive'] = 'true';
}
for($i = 0; $c = count($data); $i < $c; $i++) {, but the time difference will be very small anyway, so it doesn't matter.
use the referencing:
foreach($data as &$onearray) {
$onearray['alive'] = 'true';
}
unset($onearray)
and clean up the reference afterwards, so further code will not mess it up
In order to be able to directly modify array elements within the loop precede $value with &. In that case the value will be assigned by reference.
see foreach-reference for more: https://www.php.net/manual/en/control-structures.foreach.php
Use the built in function array_walk — Apply a user function to every member of an array
<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
function test_alter(&$item1, $key, $prefix)
{
$item1 = "$prefix: $item1";
}
function test_print($item2, $key)
{
echo "$key. $item2<br />\n";
}
echo "Before ...:\n";
array_walk($fruits, 'test_print');
array_walk($fruits, 'test_alter', 'fruit');
echo "... and after:\n";
array_walk($fruits, 'test_print');
?>
Output
Before ...:
d. lemon
a. orange
b. banana
c. apple
... and after:
d. fruit: lemon
a. fruit: orange
b. fruit: banana
c. fruit: apple