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@ 2018-03-23T17:14:29Z

<?php

$arr = array("station8", "2ndExit", "block9a", "floor5");

echo "<pre>" . __FILE__ . '-->' . __METHOD__ . ':' . __LINE__ . PHP_EOL;
var_dump(minMaxNum($arr));
die();

function minMaxNum ($arr = array()) {
    $min = $max = null;
    foreach ($arr as $value) {
        $value = preg_split('/(?<=\d)(?=[a-zA-Z])|(?<=[a-zA-Z])(?=\d)/i', $value);
        $value = array_filter($value, function ($n){
            if(!is_numeric($n)) {
                unset($n);
            } else {
                return $n;
            }
        });
        foreach($value as $item) {
            if($min == null && $max == null) { // not initiated
                $min = $max = $item;
            } else {
                if($item < $min) $min = $item;
                if($item > $max) $max = $item;
            }
        }
    }
    echo "<pre>" . __FILE__ . '-->' . __METHOD__ . ':' . __LINE__ . PHP_EOL;
    var_dump($min, $max);
    die();
}

Output for git.master, git.master_jit, rfc.property-hooks: <pre>/in/Qb6Y7-->:5 <pre>/in/Qb6Y7-->minMaxNum:29 string(1) "2" string(1) "9"

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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