Reverse array elements with specific value - php

Question

I have an array like this
$array = array( [0] => 'red1', [1] => 'blue1', [2] => 'red2', [3] => 'red3', [4] => 'blue2' );
A want to reverse order of elements with red value only so it looks like this:
$array = array( [0] => 'red3', [1] => 'blue1', [2] => 'red2', [3] => 'red1', [4] => 'blue2' );

Answer 1

I think a possible solution might be to:
Get all the values from the $array that you are looking for and
store them in an array $found
Reverse the values in $found keeping the keys
Replace the values in $array with the values from $found using
the key
For example:
$array = array(0 => 'red1', 1 => 'blue1', 2 => 'red2', 3 => 'red3', 4 => 'blue2');
// First get all the values with 'red' and store them in an array
$found = preg_grep('/red\d+/', $array);
// Reverse the values, keeping the keys
$found = array_combine(
array_keys($found),
array_reverse(
array_values($found)
)
);
// Then replace the values of $array with values having the same keys in $found
$array = array_replace($array, $found);
var_dump($array);
Will result in:
array(5) {
[0]=>
string(4) "red3"
[1]=>
string(5) "blue1"
[2]=>
string(4) "red2"
[3]=>
string(4) "red1"
[4]=>
string(5) "blue2"
}

Answer 2

You can catch red's quote to a new array and sort them.
<?php
$arr = array(
'red1',
'blue1',
'red2',
'red3',
'blue2'
);
$sortArr = array();
for ($i=0; $i < sizeof($arr); $i++) {
if(strstr($arr[$i], "red")){
$sortArr[] = &$arr[$i];
}
}
?>

Answer 3

I think you can do using searching specific words by strpos and sorting array by ksort (sort associative arrays in ascending order, according to the key)
foreach ($array as $key => $value) {
if(strpos($value,"red") !== false){
($key === 0) ? $index = 3 : (($key === 3) ? $index = 0 : $index = 2);
$temp[$index] = $value;
}
else {
$temp[$key] = $value;
}
}
ksort($temp);
var_dump($temp);
[But It will not work in larger array than this]