PHP to write Tab Characters inside a file?

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The tab character is \t. Notice the use of " instead of '.

$chunk = "<html>\t<head>\t\t<title>\t</head>";

PHP Strings – Double quoted

If the string is enclosed in double-quotes (“), PHP will interpret
more escape sequences for special characters:

…

\t horizontal tab (HT or 0x09 (9) in ASCII)

Also, let me recommend the fputcsv() function which is for the purpose of writing CSV files.

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