Description:
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From manual page: http://www.php.net/ref.mcrypt
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This comment has several issues:
http://php.net/manual/en/ref.mcrypt.php#99263

1.
This code snippet can strip the trailing characters when decrypting if
they match with the padding character.
It shouldn't strip more characters when decrypting than
ord(substr($dec, strlen($dec)-1,1))
Because otherwise it removes the additional characters from the original
string. (If they match accidentally.)

2.
The IV is completely useless here:
The IV is ignored in ECB mode as this mode does not require it. You will
need to have the same IV (think: starting point) both at encryption and
decryption stages, otherwise your encryption will fail.

The first point can lead corruptions, so I suggest to remove this comment. (I send an email already to the original author a few days ago.)