in_array really loves typecast
<?php
$a = array('7.1');
var_dump(in_array('7.10', $a));
?>bool(true)I have no explanation. Both are strings. Really: WTF?
Note that the reason is not really in_array but var_dump("7.1"=="7.10"); this being TRUE. Which is again quite unexpected: why does PHP cast strings to floats? It is float:
<?php
$a = '7.1';
$b = '7.1' . str_repeat('0', 14) . '1';
print "$a\n$b\n";
var_dump($a==$b);
$b = '7.1' . str_repeat('0', 15) . '1';
print "$b\n";
var_dump($a==$b);
?>
Comments
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use the third parameter
If you set the third parameter of in_array() to true, you will get an === comparison.
I'm not saying that boolean parameters are good design; I'm not saying that this should default to false and I'm not saying that == is intuitive.
But this particular problem you can solve with that $strict parameter
pilif@tali ~ % php -a
Interactive shell
php > $a = array('7.1');
php > var_dump(in_array('7.10', $a, true));
bool(false)
php >
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