CODEWITHSUNDEEP
phpstring
simPod
simPod

Reputation: 13506

PHP all full-uppercase words to lowercase

I'd like to do something like this:

$string = "Lorem ipsum DOLOR Sit amet";
...some magic here... -> $finalString
$finalString = "Lorem ipsum dolor Sit amet"

Basically I wan't to convert all words that are fully uppercase to full lowercase.

Upvotes: 2

Views: 117

Answers (4)

Shankar Narayana Damodaran
Shankar Narayana Damodaran

Reputation: 68556

A sans regex solution...

<?php
$string = "Lorem ipsum DOLOR Sit amet";
$str_arr = explode(' ',$string);
foreach($str_arr as &$val)
{
if($val==strtoupper($val))
{
$val=strtolower($val);
}
}
echo $str= implode(' ',$str_arr); //"prints" Lorem ipsum dolor Sit amet

Upvotes: 3

user2680766
user2680766

Reputation:

This is what I suggested initially:

$finalString = preg_replace("/\\b[A-Z]+\\b/e", "strtolower(\"\\0\");", $string);

But, since PHP 5.5.0 onwards, the e modifier in preg_replace has become deprecated. So the correct alternative would be preg_replace_callback:

$string = "Lorem ipsum DOLOR Sit amet";
$finalString = preg_replace_callback(
    "/\\b[A-Z]+\\b/",
    function($matches){
    return strtolower($matches[0]);
    },
    $string
);

Upvotes: 6

TiiJ7
TiiJ7

Reputation: 3412

preg_replace_callback is what you need.

$string = "Lorem ipsum DOLOR Sit amet";

$finalString = preg_replace_callback('/\b([A-Z]+)\b/', function($m) {
        return strtolower($m[1]);
}, $string);

echo $finalString;

$m[1] matches the first capturing group ([A-Z]+) which matches uppercase words. \b represent word boundaries.

Upvotes: 2

BlitZ
BlitZ

Reputation: 12168

Use preg_replace_callback() with expression /\b[A-Z]+\b/ (\b - start or end of word, [A-Z]+ - all charactes are uppercased and there is at least one character):

<?php
header('Content-Type: text/plain; charset=utf-8');

$string = 'Lorem ipsum DOLOR Sit amet';

$result = preg_replace_callback(
    '/\b[A-Z]+\b/',
    function($matches){
        return strtolower($matches[0]);
    },
    $string
);

echo $result;
?>

Shows:

Lorem ipsum dolor Sit amet

P.S.: You may also update regex to lowercase only words, where at least 2 characters by:

/\b[A-Z]{2,}\b/

Upvotes: 1

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