Getting numbers only from an array [duplicate] - php

Question

This question already has answers here:
Extract a single (unsigned) integer from a string
(23 answers)
Closed 6 years ago.
i have this array in php
$name = array("page18.jpg","page16.jpg","page17.jpg","page19.jpg",);
i wanted to strip all alphabets and dots in the string remains only number like
$name = array("18","16","17","19");
how do i achieve that can some one please guide me how to do it in PHP language

Answer 1

Try this,use preg_replace
$name = array("page18.jpg","page16.jpg","page17.jpg","page19.jpg",);
foreach($name as $val)
{
$new_name[] = preg_replace('/\D/', '', $val);
}
DEMO

Answer 2

You can do it without using Regex by using string replace function (str_replace()):
<?php
$name = array("page18.jpg","page16.jpg","page17.jpg","page19.jpg",);
$myArra = array();
foreach ($name as $key => $value) {
$var = str_replace("page", "", $value);
$var = str_replace(".jpg", "", $var);
$myArra[] = $var; // store all value without text and .jpg
}
print_r($myArra);
?>
Result:
Array
(
[0] => 18
[1] => 16
[2] => 17
[3] => 19
)
Or, if you want to use Regex, than you can use /\d+/ pattern as like:
<?php
$name = array("page18.jpg","page16.jpg","page17.jpg","page19.jpg",);
$myArra = array();
foreach ($name as $key => $value) {
preg_match_all('/\d+/', $value, $matches);
$myArra[] = $matches[0][0]; // store all value without text and .jpg
}
echo "<pre>";
print_r($myArra);
?>
Result:
Array
(
[0] => 18
[1] => 16
[2] => 17
[3] => 19
)

Answer 3

Aside from using str_replace() and preg_replace(), you can use array_map() and filter_val() like so:
$name = array("page18.jpg","page16.jpg","page17.jpg","page19.jpg",);
$name = array_map(function($fv) {
return filter_var($fv, FILTER_SANITIZE_NUMBER_INT);
}, $name);
print_r($name);
Output:
Array
(
[0] => 18
[1] => 16
[2] => 17
[3] => 19
)

Answer 4

A very simplified and native solution from the house of PHP:
$name = array("page18.jpg","page16.jpg","page17.jpg","page19.jpg",);
foreach ($name as $n) {
$num_arr[] = filter_var($n, FILTER_SANITIZE_NUMBER_INT);
}
var_dump($num_arr);
exit();
Outputs:
Array ( [0] => 18 [1] => 16 [2] => 17 [3] => 19 )
enjoy fresh air ;)

Answer 5

<?php
$name = array ("page18.jpg","page16.jpg","page17.jpg","page19.jpg");
$myarray =array();
foreach($name as $key =>$value){
$page_replace= str_replace("page", "",$value); //replace page as a blank
$jpg_replace= str_replace(".jpg","",$page_replace); //replace jpg to blank
$myarray[] =$jpg_replace;//stroing without jpg and page getting resulut as key value pair
}
echo "<pre>";
print_r($myarray);
?>