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);
?>

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<?php$a = array('7.1' =>

<?php
$a
= array('7.1' => '7.1');
var_dump(in_array('7.10000000000000001', $a));
var_dump(array_key_exists('7.10000000000000001', $a));
?>

bool(true)
bool(false)

Makes sense, NOT!

Sure ...

<?php
var_dump
('7.10000000000000001' == '7.10000000000000002');
?>

bool(true)

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I use in_array() to check

I use in_array() to check whether a value exists in an array like below,

$a = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $a))
{
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}

//print_r($a);

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Example: $a == $b Name:

Example: $a == $b
Name: Equal
Result: TRUE if $a is equal to $b after ***TYPE JUGGLING***.

Also you can force usage of 'identical' operator instead of 'equal' by setting third argument (`$strict`) to true.

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Strict mode

PHP manual: http://php.net/manual/en/function.in-array.php read the 3rd parameter info.

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array_

I use in_array() to check whether a value exists in an array like below,

$a = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $a))
{
echo "Got Irix";
}

//print_r($a);

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Learn to read&understand!

http://www.php.net/manual/en/function.in-array.php
Searches haystack for needle using ***LOOSE COMPARISON*** unless strict is set.

It means that its compared as in following example:

var_dump("7.1" == "7.10");
>>> bool(true)

http://www.php.net/manual/en/language.operators.comparison.php
Example: $a == $b
Name: Equal
Result: TRUE if $a is equal to $b after ***TYPE JUGGLING***.

Also you can force usage of 'identical' operator instead of 'equal' by setting third argument (`$strict`) to true.

Learn to use operators and then flame :|

What's with all the spam?

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