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Difference between spaces with "\t", "\r" or a simple space

playboy-1990 Posted messages 593 Status Member -  
boly38 Posted messages 267 Registration date   Status Member Last intervention   -
Hello,
In PHP for example you can create spaces with ""\t"" (tab), ""\r"" (carriage return)
or even "" ""
Here is an example 
<?php print 'Bonjour' . "\r" . $membre . "\t" . 'vous avez' . ' ' . $score . "\r" . 'score !';

But what is the real difference ?
and why must the signs ""\r"" etc be surrounded by double quotes ?
To finish which is the fastest ?
Thanks

1 answer

  1.
    boly38 Posted messages 267 Registration date   Status Member Last intervention   80
     
    Hello,
    the difference between each "escaped sequence" mentioned is their ASCII representation. A tabulation does not appear the same way as a newline or as a space..

    cf. https://fr.wikipedia.org/wiki/American_Standard_Code_for_Information_Interchange

    > why the double quotes?

    PHP says it: I quote the PHP.net manual: https://www.php.net/manual/fr/language.types.string.php
    "If the string is enclosed in double quotes ("), PHP will interpret more escape sequences for special characters

    >To finish, which is faster?
    Hard to understand this question. I would say that each escape sequence occupies the same amount of memory, so they are equivalent in terms of data transfer..
    2