How to replace the colour of CSS in php by using preg_replace?

Question

cssFile='
:root{
    --buttonRequestColour: #0DA5FF;/*--buttonRequestColour:*/

    --themeColour: #f58134;/*--themeColour:*/
}

I want to change the colour only as below:

:root{
    --buttonRequestColour: #FFFFFF;/*--buttonRequestColour:*/

    --themeColour: #00000;/*--themeColour:*/
}
';

I am using

  function update_colour($colour, $start, $end){
    global $cssFile;
    $search = '/('.$start.')(.*)('.$end.')/';
    $replace = $start.$colour.$end;

    $cssFile= preg_replace($search,$replace,$cssFile);
    return $cssFile;
  }

$cssFile=update_colour(#FFFFFF,'--themeColour:',';/*--buttonRequestColour:*/');

$cssFile=update_colour(#00000,'--buttonRequestColour:',';/*--buttonRequestColour:*/');

However, the result is :

:root{
    --buttonRequestColour:#00000 /*--themeColour:*/
}
';

The fourth bird · Accepted Answer · 2022-10-26 10:55:27Z

According to the example data, the first call should be

$cssFile=update_colour(#FFFFFF,'--themeColour:',';/*--buttonRequestColour:*/');

Then you can change the pattern delimiter from / to for example ~ and make use of preg_quote.

Updated code:

$cssFile = '
:root{
    --buttonRequestColour: #0DA5FF;/*--buttonRequestColour:*/

    --themeColour: #f58134;/*--themeColour:*/
}';
echo $cssFile;

function update_colour($colour, $start, $end)
{
    global $cssFile;
    $search = '~(' . preg_quote($start) . ')(.*)(' . preg_quote($end) . ')~';
    $replace = $start . $colour . $end;

    $cssFile = preg_replace(
        $search,
        $replace,
        $cssFile
    );

    return $cssFile;
}

$cssFile = update_colour('#00000', '--buttonRequestColour:', ';/*--buttonRequestColour:*/');
echo $cssFile;
$cssFile = update_colour('#FFFFFF', '--themeColour:', ';/*--themeColour:*/');
echo $cssFile;

Output

:root{
    --buttonRequestColour: #0DA5FF;/*--buttonRequestColour:*/

    --themeColour: #f58134;/*--themeColour:*/
}
:root{
    --buttonRequestColour:#00000;/*--buttonRequestColour:*/

    --themeColour: #f58134;/*--themeColour:*/
}
:root{
    --buttonRequestColour:#00000;/*--buttonRequestColour:*/

    --themeColour:#FFFFFF;/*--themeColour:*/
}

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