Get the boolean value of a variable

Variable handling Functions
debug_zval_dump
Variable handling Functions
PHP Manual

# boolval

(PHP 5 >= 5.5.0, PHP 7)

boolval — Get the boolean value of a variable

### Description

boolean boolval ( mixed `$var` )

Returns the boolean value of `var`.

### Parameters

`var`

  The scalar value being converted to a boolean.

### Return Values

The boolean value of `var`.

### Examples

Example #1 boolval() examples

`<?php
echo '0: '.(boolval(0) ? 'true' : 'false')."\n";
echo '42: '.(boolval(42) ? 'true' : 'false')."\n";
echo '0.0: '.(boolval(0.0) ? 'true' : 'false')."\n";
echo '4.2: '.(boolval(4.2) ? 'true' : 'false')."\n";
echo '"": '.(boolval("") ? 'true' : 'false')."\n";
echo '"string": '.(boolval("string") ? 'true' : 'false')."\n";
echo '"0": '.(boolval("0") ? 'true' : 'false')."\n";
echo '"1": '.(boolval("1") ? 'true' : 'false')."\n";
echo '[1, 2]: '.(boolval([1, 2]) ? 'true' : 'false')."\n";
echo '[]: '.(boolval([]) ? 'true' : 'false')."\n";
echo 'stdClass: '.(boolval(new stdClass) ? 'true' : 'false')."\n";
?>`

The above example will output:

    0:        false
    42:       true
    0.0:      false
    4.2:      true
    "":       false
    "string": true
    "0":      false
    "1":      true
    [1, 2]:   true
    []:       false
    stdClass: true

### See Also

- floatval() - Get float value of a variable
- intval() - Get the integer value of a variable
- strval() - Get string value of a variable
- settype() - Set the type of a variable
- is_bool() - Finds out whether a variable is a boolean
- Type juggling

Variable handling Functions
debug_zval_dump
Variable handling Functions
PHP Manual