wordwrap() uses the break string as the line break detected, and the break inserted, so your text must be standardized to the line break you want in the wordwrap() output before using wordwrap, otherwise you will get line breaks inserted regardless of the location of existing line breaks in your text.
<?php
$linebreak = '<br/>' . PHP_EOL;
$width = 5;
$standardized = preg_replace('/\r?\n/',$linebreak, "abc abc abc\nabc abc abc\r\nabc abc abc");
echo 'Standardized EOL:', PHP_EOL, $standardized, PHP_EOL, PHP_EOL; echo "Wrapped at $width:", PHP_EOL, wordwrap( $standardized, 7, $linebreak), PHP_EOL;
?>
$ php -f test.php
Standardized EOL:
abc abc abc<br/>
abc abc abc<br/>
abc abc abc
Wrapped at 5:
abc abc<br/>
abc<br/>
abc abc<br/>
abc<br/>
abc abc<br/>
abc
