intval returns unxpected result for string with "." and "e" which is not documented.

[Sunvas]

echo intval('42.'); //42     ok
echo intval('42.42'); //42     ok
echo intval('42.42e'); //42    ok
echo intval('42.42e42'); //9223372036854775807

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

[alexislefebvre]

The e notation is documented on Numeric strings:

Any string that contains the letter E (case insensitive) bounded by numbers will be seen as a number expressed in scientific notation. This can produce unexpected results.

The “Behavior prior to PHP 8.0.0” part shows an example with a dot and e, as in your example.

<?php
$foo = 1 + "-1.3e3";              // $foo is float (-1299)

Does it answer your question?

[Sunvas]

@alexislefebvre yes, it answers. In my opinion, such an example should be mentioned on the documentation page for the intval function.