Passing empty string to needle arg always returns 0

[derikb]

From manual page: https://php.net/function.strpos

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Passing an empty string to the $needle arg will cause strpos to always return 0. That is not at all clear from the docs, and perhaps more prominent since php 8 stopped throwing warnings for that. Might be good if the Needle or Return documentation mentioned that as it's not totally intuitive.

[nielsdos]

It's intuitive once you consider that the empty string is a substring at every offset of any string. Since strpos returns the first occurrence it correctly returns 0.