Replace symbol (with a condition) on PHP [closed] - php

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how correctly make on php ?
If set range have small letters -> replace them on big.
length of string - const
number of symbols from 0
set range : [4,6]
Example :
17xG2v9Hj5 -> 17xG2V9Hj5
b7qfK5yte9 -> b7qfK5Yte9
My code :
$m = '17xG2v9Hj5';
$s1 = mb_substr($m, 0, 4); // -> 17xG
$s2 = mb_substr($m, 4, 3); // -> 2v9
$ss = ucwords(strtoupper($s2)); // -> 2V9
$s3 = mb_substr($m, 7,3); // -> Hj5
$my = $s1.$ss.$s3; // -> 17xG2V9Hj5
var_dump($m).'<br/>';
var_dump($s1).'<br/>';
var_dump($s2).'<br/>';
var_dump($ss).'<br/>';
var_dump($s3).'<br/>';
var_dump($my).'<br/>';// ??? ['<br/>'] for [var_dump()]
// don't work;
String : [a-z] and [0-9].
It is possible to make more shortly and faster?
Thanks.

Answer 1

I'm really not sure what you're trying to achieve?
var_dump is typically used for debug purposes, its output will be more readable if wrapped in <pre></pre> tags.
var_dump($my).'<br/>';
Will not actually append '<br/>' to the output of var_dump it will append it the the value returned by var_dump, in this case void
ie.
$out = var_dump($my).'<br/>'; //$out == '<br/>'
If you want to output <br/> after var_dump you must echo it separately.
ie.
var_dump($my);
echo '<br/>';

Answer 2

You may use substr_replace to do this in one round (Assuming range and string-length are fixed)
$in = '17xG2v9Hj5';
var_dump(substr_replace($in, mb_strtoupper(mb_substr($in, 4, 3)), 4, 3));
A multibyte variant of the substr_replace function can be found here
Answer below is based on Revision 1 of the question assuming a more general solution is wanted
Naive solution but should work if I understood your question correctly:
<?php
$in = '17xG2v9Hj5';
$range = [4,6];
var_dump(uc_range($in, $range));
function uc_range($string, array $range) {
if(!is_string($string)) {
throw new InvalidArgumentException('$string is supposed to be a string');
}
$chars = str_split_unicode($string);
foreach(range($range[0], $range[1]) as $keyIndex) {
if(isset($chars[$keyIndex])) {
$chars[$keyIndex] = mb_strtoupper($chars[$keyIndex]);
}
}
return implode("", $chars);
}
// see http://www.php.net/manual/en/function.str-split.php#107658
function str_split_unicode($str, $l = 0) {
if ($l > 0) {
$ret = array();
$len = mb_strlen($str, "UTF-8");
for ($i = 0; $i < $len; $i += $l) {
$ret[] = mb_substr($str, $i, $l, "UTF-8");
}
return $ret;
}
return preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY);
}