PHP strange str_split array output - php

Question

Ok, im having troubles figuring out why my str_split is giving strange array output, this is the code:
$test = array(0 => array(53, 22, 12, "string"),
1 => array(94, 84, 94, "string1"),
2 => array(56, 45, 104, "string2"),
3 => array(33, 21, 20, 23, "string3"),
4 => array(44, 55, 66, 77)
);
$newArray = array();
$keys = array_keys($test);
for($i=0; $i < count($test); $i++){
foreach($test[$keys[$i]] as $key => $value){
}
$output = str_split($key);
echo "<pre>";
print_r($output);
echo "</pre>";
Array output is:
Array
(
[0] => 3
)
Array
(
[0] => 3
)
Array
(
[0] => 3
)
Array
(
[0] => 4
)
Array
(
[0] => 3
)
And im expecting output like this:
Array ([0] => 3
[1] => 3
[2] => 3
[3] => 4
[4] => 3
)
Im wondering why is this happening? Thank you.

Answer 1

To achieve the output given, you would just do:
<?php
$test = array(0 => array(53, 22, 12, "string"),
1 => array(94, 84, 94, "string1"),
2 => array(56, 45, 104, "string2"),
3 => array(33, 21, 20, 23, "string3"),
4 => array(44, 55, 66, 77)
);
foreach ($test as $row) {
$output[] = count($row)-1; // non-associative, so the last key is
} // just the length of the array minus 1
print_r($output);
?>
as the sub-arrays are not associative.
If they are, replace the line inside the loop with:
$keys = array_keys($row); // get the keys of the row
$output[] = $keys[count($keys)-1]; // and access the last of them

Answer 2

with your code the solution is, but it is not an efficient way of doing it.
<?php
$test = array(0 => array(53, 22, 12, "string"),
1 => array(94, 84, 94, "string1"),
2 => array(56, 45, 104, "string2"),
3 => array(33, 21, 20, 23, "string3"),
4 => array(44, 55, 66, 77)
);
$newArray = array();
$keys = array_keys($test);
for($i=0; $i < count($test); $i++){
foreach($test[$i] as $key => $value){
$output[$i] = str_split($key)[0];
}
echo "<pre>";
//print_r($output);
echo "</pre>";
}
var_dump($output);
output
array (size=5)
0 => string '3' (length=1)
1 => string '3' (length=1)
2 => string '3' (length=1)
3 => string '4' (length=1)
4 => string '3' (length=1)
But by changing it to this will work, for arrays when the string position is not constant .
<?php
$test = array(0 => array(53, 22, 12, "string"),
1 => array(94, 84, 94, "string1"),
2 => array(56, 45, 104, "string2"),
3 => array(33, 21, "string3", 20, 23),
4 => array(44, 55, 66, 77)
);
$newArray = array();
$keys = array_keys($test);
for($i=0; $i < count($test); $i++){
foreach($test[$i] as $key => $value){
if(is_string($value)){
unset($test[$i][$key]);
}
$output[$i] = count($test[$i]);
}
echo "<pre>";
//print_r($output);
echo "</pre>";
}
var_dump($output);
output
array (size=5)
0 => int 3
1 => int 3
2 => int 3
3 => int 4
4 => int 4