# integer

integer — Is a number of the set ℤ = {..., -2, -1, 0, 1, 2, ...}.

Can be specified in decimal (base 10), hexadecimal (base 16), octal (base 8) or binary (base 2) notation.

### Integer literals

<?php
$a = 1234; // decimal number$a = -123; // a negative number
$a = 0123; // octal number (equivalent to 83 decimal)$a = 0x1A; // hexadecimal number (equivalent to 26 decimal)
$a = 0b11111111; // binary number (equivalent to 255 decimal) ?> ### Integer overflow <?php$large_number = 2147483647;
var_dump($large_number); // int(2147483647)$large_number = 2147483648;
var_dump($large_number); // float(2147483648)$million = 1000000;
$large_number = 50000 *$million;
var_dump($large_number); // float(50000000000) ?> <?php$large_number = 9223372036854775807;
var_dump($large_number); // int(9223372036854775807)$large_number = 9223372036854775808;
var_dump($large_number); // float(9.2233720368548E+18)$million = 1000000;
$large_number = 50000000000000 *$million;
var_dump(\$large_number);                     // float(5.0E+19)
?>

If PHP encounters a number beyond the bounds of the integer type, it will be interpreted as a float instead.

An operation which results in a number beyond the bounds of the integer type will return a float instead.

### Converting to integer

• To explicitly convert a value to integer, use either the (int) or (integer) casts.
• In most cases the cast is not needed, since a value will be automatically converted if an operator, function or control structure requires an integer argument.
• A value can also be converted to integer with the intval() function.
• If a resource is converted to an integer, then the result will be the unique resource number assigned to the resource by PHP at runtime.
• FALSE will yield 0 (zero), and TRUE will yield 1 (one).
• When converting from float to integer, the number will be rounded towards zero.
• NULL is always converted to zero (0).
• The behaviour of converting to integer is undefined for other types. Do not rely on any observed behaviour, as it can change without notice.

integer

## integer — Structure map

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