Getting value in loop and replace it in string once in PHP

Question

I'm trying to find & replace my values from inside string after getting values from inside loop. When I replace my string from inside loop then(that method isn't suitable)as it replaces one by one until loop ends and I get a lot of strings with single replacements at each. I'm trying to replace the whole string with loop values outside only once. Here's my code.

$str = "wi are checking it";   
$langs = array ('w', 'c', 'i');
foreach ($langs as $lang) {
    $search = $lang;  
    $url[] = "<span style='color:red;'>".$search."</span>";
    $qw[] = $search;
}
$op = implode("", $url);
$er = implode("", $qw);
echo $op."<br>";
echo $er."<br>";
$new = str_replace($er, $op, $str);
echo $new;

It's output:

Expected Output:

[ Expected Result

Perhaps the first thing to do is to use variable names that actually describe what the variable contains. Meaningful variable names. That would make understanding your code a lot easier. — KIKO Software
– KIKO Software, Commented May 24, 2022 at 9:11
$qw[] = $search; in the loop? So the $qw will now look EXACTLY like the $langs array ??? — RiggsFolly
– RiggsFolly, Commented May 24, 2022 at 9:15
@RiggsFolly Yes actually url[] has the W,C,I in red colors. And $qw[] has them as it is(in default color). I want to replace these red color values with black colored once in the string. — Lalarukh khan
– Lalarukh khan, Commented May 24, 2022 at 9:18

mighty_dev · Accepted Answer · 2022-05-24 11:08:45Z

2

Non-regex way:

Make a hashmap of your lang characters and loop your string character by character. If the current character is set in the map, add those span tags, else just append the current character.

<?php

$str = "we are checking it";   
$langs = array ('w', 'c', 'i');
$lang_map = array_flip($langs);

$new_str = "";

for($i = 0; $i < strlen($str); ++$i){
    if(isset($lang_map[ $str[$i] ])){
        $new_str .= "<span style='color:red;'>".$str[$i]."</span>";
    }else{
        $new_str .= $str[$i];
    }
}

echo $new_str;

Online Demo

Regex way:

You can use preg_replace to replace each character from lang surrounded by span tags like below:

<?php

$str = "we are checking it";   
$langs = array ('w', 'c', 'i');
$lang_regex = preg_quote(implode("", $langs));

$str = preg_replace("/[$lang_regex]/", "<span style='color:red;'>$0</span>", $str);

echo $str;

Online Demo

answered May 24, 2022 at 11:08

mighty_dev

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6 Comments

KIKO Software Over a year ago

Isn't the implicit assumption here that $langs will always contain single letters?

mighty_dev Over a year ago

@KIKOSoftware Sure is but I don't wish to speculate unless OP explicitly says so.

KIKO Software Over a year ago

Yes, this should have been mentioned in the question.

Lalarukh khan Over a year ago

Ohh!! Thanks a lot! This is what I was in fond of :)

Lalarukh khan Over a year ago

@KIKOSoftware Yes values are getting as single. Actually I was splitting my string into single character and was calling it as array. That's why only single character was being called.

|

Faizul Islam · Accepted Answer · 2022-05-24 09:18:08Z

0

You can try with this method.

$youText  = "wi are checking it";
$find     = ["wi", "it"];
$replace  = ["we", "its"];
$result   = str_replace($find, $replace, $youText);
echo $result;

answered May 24, 2022 at 9:18

Faizul Islam

776 bronze badges

1 Comment

Lalarukh khan Over a year ago

Actually this is a correct way of doing. But in the question i wrote the array values. However on real these array values are coming dynamically and that's why I'm calling it by for each loop.

Abhay Bisht · Accepted Answer · 2022-05-24 10:52:30Z

0

You can use preg_replace function :-

<?php

$str = "wi are checking it";   
$langs = array ('w', 'i');

$pattern = array();
$htm = array();


for ($i = 0; $i < count($langs) ; $i++) {
    $pattern[$i] = "/".$langs[$i]."/";
    $htm[$i] = "<span style='color:red;'>".$langs[$i]."</span>";
}

$limit = -1;
$count = 0;

$new = preg_replace($pattern, $htm, $str, $limit, $count);

#echo htmlspecialchars($str)."<br>";
echo ($new);
    
?>

Your required Result :-

<span style='color:red;'>w</span><span style='color:red;'>i</span> are checking it

Sorry but you can't replace 'c' character because the replacing string also contains 'c' char (i.e. c in ...style = "color:red") so this function re-replace this 'c' char and generate a bugged string... 😅

Fix this bug by yourself For reference read this

edited May 24, 2022 at 10:52

answered May 24, 2022 at 10:12

Abhay Bisht

1847 bronze badges

2 Comments

Lalarukh khan Over a year ago

Hi, @techno-gamer Actually I'm trying to get result like this: drive.google.com/file/d/1Ez-OaKRlgNAoMZo7_m-6pFjaDieMQNYb/…

Abhay Bisht Over a year ago

set $limit = -1

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