php - How str_replace value in json?

could somebody help me with str_replace value in json file, please? My code working well on replace string, but it dosnt working on value in json.

Working well to replace correctly "old" with "new" in all json files:

foreach(glob('*.json') as $path_to_file) {
    $file_contents = file_get_contents($path_to_file); 
    $file_contents = str_replace('old','new',$file_contents);
    file_put_contents($path_to_file,$file_contents);
}
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But when I need replace"min_order":"" with"min_order":"1" it doesn't work. I can not replace"" with"1" directly, because I have in json many other values.

I tested this code, but it didn't work:

foreach(glob('*.json') as $path_to_file) {
    $file_contents = file_get_contents($path_to_file);
    $file_contents = str_replace('"min_order":""','"min_order":"1"',$file_contents);
    file_put_contents($path_to_file,$file_contents);
}
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Can somebody help me with this issue please?

Thank you in advance. Jiri

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