Get specific content from a string - php

Question

I need to get numbers as an array from a given string.
Example string:
$t = '1-P,2-T,3-P,4-R,5-C,6-T,';
Expected output:
if I search -T the output needs to be like this:
array(
[0] => 2,
[1] => 6
)
if it's -P:
array(
[0] => 1,
[1] => 3
)
I tried var_export(explode("-T,",$t)); but it didn't work as expected.
Can any one give me a suggestion to get this?

Answer 1

The below matches the full integer number which preceeds the search term -P.
Let's keep it concise:
$matches = array();
if (preg_match_all('/([0-9]+)\-P/', $t, $matches) >= 1) {
var_dump($matches[1]);
}
Search for '/([0-9]+)\-P/, '/([0-9]+)\-C/, '/([0-9]+)\-T/ an so on.
A more dynamic way to look for different search terms/filters:
$filter = '-T';
$pattern = sprintf('/([0-9]+)%s/', preg_quote($filter));
See preg_match_all and preg_quote functions.

Answer 2

Try this:
$t = '211111111131-P,2-T,3654554-P,4-R,5-C,6-T,';
$find = "-P"; // Search element
$found = []; // Result array
$array = explode(",", $t); // Breaking up into array
foreach($array as $arr) {
if (strpos($arr, $find)) { // Checking if search element is found in $arr
$found[] = explode('-',$arr)[0]; // Extracting the number prefix e.g 1 for 1-P
}
}
Output:
Array
(
[0] => 1
[1] => 3
)

Answer 3

Use it as
$t = '1-P,2-T,3-P,4-R,5-C,6-T,';
$data = explode(",", $t);
print_r($data);
$row=array();
for ($i = 0; $i <= count($data); $i++) {
if (!empty($data[$i])) {
if (strpos($data[$i], '-T') !== false) {// pass find value here
$final = explode("-", $data[$i]);
$row[]=$final[0];
}
}
}
print_r($row);
Output
Array
(
[0] => 2
[1] => 6
)
DEMO

Answer 4

$t = '1-P,2-T,3-P,4-R,5-C,6-T,';
$temp = [];
// if the last comma is not typo the 3rd argument `-1` omit empty item
$array = explode(",", $t, -1);
foreach($array as $arr) {
list($v, $k) = explode('-', $arr);
$temp[$k][] = $v;
}
print_r($temp['T']);
demo

Answer 5

Lots of good answers here already, but none take the approach of first putting the data into a better structure.
The code below converts the data to an associative array mapping letters to arrays of numbers, so that you can then do repeated lookups by whichever letter you want:
$t = '1-P,2-T,3-P,4-R,5-C,6-T,';
$a = array_filter(explode(',', $t));
$map = [];
foreach($a as $item) {
$exploded = explode('-', $item);
$number = $exploded[0];
$letter = $exploded[1];
if (!array_key_exists($letter, $map)) {
$map[$letter] = [];
}
$map[$letter][] = $number;
}
print_r($map);
// Array
// (
// [P] => Array
// (
// [0] => 1
// [1] => 3
// )
//
// [T] => Array
// (
// [0] => 2
// [1] => 6
// )
//
// [R] => Array
// (
// [0] => 4
// )
//
// [C] => Array
// (
// [0] => 5
// )
//
// )
print_r($map['T']);
// Array
// (
// [0] => 2
// [1] => 6
// )
print_r($map['P']);
// Array
// (
// [0] => 1
// [1] => 3
// )