How to add a string value into a PHP array

The array_push is working as it is designed for.

It will add the value and returns the number of elements in that array.

so it is natural if it is returning 3 your array has 2 elements after array push there are now three elements.

You should print_r($array2) your array and look the elements.

This line:

$push = array_push($array2, $value);

Should be just

array_push($array2, $value);

array_push() uses reference to the array for the first parameter. When you print_r(), you print the array $array2, instead of $push.

You are printing the return value of array_push which is the number of items in the array after the push. Try this:

<?php

$array = array("one","two","three");
$array2 = array("test","test2");

foreach ($array as $value) {
    if ($value === 'one') {
       array_push($array2, $value);
    }
}

print_r($array2);