How to convert string to boolean php

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How can I convert string to boolean?

$string = 'false';

$test_mode_mail = settype($string, 'boolean');

var_dump($test_mode_mail);

if($test_mode_mail) echo 'test mode is on.';

it returns,

boolean true

but it should be boolean false.


Strings always evaluate to boolean true unless they have a value that's considered "empty" by PHP (taken from the documentation for empty):

  1. "" (an empty string);
  2. "0" (0 as a string)

If you need to set a boolean based on the text value of a string, then you'll need to check for the presence or otherwise of that value.

$test_mode_mail = $string === 'true'? true: false;

EDIT: The above code is intended for clarity of understanding. In actual use the following code may be more appropriate:

$test_mode_mail = ($string === 'true');

boolval - Manual, boolval. (PHP 5 >= 5.5.0, PHP 7). boolval — Get the boolean value of a variable tinyint will be 0 (zero) for values like string "false", boolean false, int 0 To convert string to boolean in PHP, the code is as follows. Use the filter_val() method−


This method was posted by @lauthiamkok in the comments. I'm posting it here as an answer to call more attention to it.

Depending on your needs, you should consider using filter_var() with the FILTER_VALIDATE_BOOLEAN flag.

filter_var(    'true', FILTER_VALIDATE_BOOLEAN); // true
filter_var(         1, FILTER_VALIDATE_BOOLEAN); // true
filter_var(       '1', FILTER_VALIDATE_BOOLEAN); // true
filter_var(      'on', FILTER_VALIDATE_BOOLEAN); // true
filter_var(     'yes', FILTER_VALIDATE_BOOLEAN); // true

filter_var(   'false', FILTER_VALIDATE_BOOLEAN); // false
filter_var(         0, FILTER_VALIDATE_BOOLEAN); // false
filter_var(       '0', FILTER_VALIDATE_BOOLEAN); // false
filter_var(     'off', FILTER_VALIDATE_BOOLEAN); // false
filter_var(      'no', FILTER_VALIDATE_BOOLEAN); // false
filter_var('asdfasdf', FILTER_VALIDATE_BOOLEAN); // false
filter_var(        '', FILTER_VALIDATE_BOOLEAN); // false
filter_var(      null, FILTER_VALIDATE_BOOLEAN); // false

How to convert string to boolean in PHP?, <?php. // PHP program to illustrate the conversion. // of String to Boolean value. // The below statement returns the boolean value true. var_dump(filter_var( 'true'  Given a string and the task is to convert given string to its boolean. Use filter_var() function to convert string to boolean value.


PHP :: Cast string to boolean, Cast string to boolean PHP. > Convert string to boolean. Description. Cast string to boolean. $val = (bool)""; // false $val = (bool)"0"; // false $val = (bool)"1"; // true  The String "false" is actually considered a "TRUE" value by PHP. The documentation says: To explicitly convert a value to boolean, use the (bool) or (boolean) casts. However, in most cases the cast is unnecessary, since a value


When working with JSON, I had to send a Boolean value via $_POST. I had a similar problem when I did something like:

if ( $_POST['myVar'] == true) {
    // do stuff;
}

In the code above, my Boolean was converted into a JSON string.

To overcome this, you can decode the string using json_decode():

//assume that : $_POST['myVar'] = 'true';
 if( json_decode('true') == true ) { //do your stuff; }

(This should normally work with Boolean values converted to string and sent to the server also by other means, i.e., other than using JSON.)

How to convert string to boolean in PHP?, To convert string to boolean in PHP, the code is as follows. Use the filter_val() method−Example Live Demo. In PHP only "0" or the empty string coerce to false; every other non-empty string coerces to true. From the manual: When converting to boolean, the following values are considered FALSE: the empty string, and the string "0" You need to write your own function to handle the strings "true" vs "false". Here, I assume everything else defaults to false:


you can use json_decode to decode that boolean

$string = 'false';
$boolean = json_decode($string);
if($boolean) {
  // Do something
} else {
  //Do something else
}

How To Evaluate String 'false' In PHP?, In PHP, falsy values such as the string "false" are evaluated as TRUE . of all the falsy values (values that evaluate to boolean false ) in PHP:  Possible duplicate of How to convert string to boolean php – Limon Monte May 24 '16 at 9:01 I'm not so familiar with Laravel, but a HTML input element with type="checkbox" requires you to set the value attribute as well, which is the value to be submitted with the form.


[100% Working Code], Though Strings always assess to boolean true until they have a value that is considered “empty” by PHP. “” represents to an empty string. To convert String into Boolean object, we can use Boolean.valueOf(string) method which returns instance of Boolean class. To get boolean true, string must contain "true". Here, case is ignored. So, "true" or "TRUE" will return boolean true.


Type-casting | PHP, Conversion from string to number is quite complected and also used rarely. PHP type casting to Boolean. We can cast any variable to Boolean using (bool) or  tinyint will be 0 (zero) for values like string "false", boolean false, int 0 tinyint will be 1 for values like string "true", boolean true, int 1 Useful if you are accepting data that might be from a language like Javascript that sends string "false" for a boolean false.


How to convert string to boolean php, Depending on your needs, you should consider using filter_var() with the FILTER_VALIDATE_BOOLEAN flag.filter_var( 'true', FILTER_VALIDATE_BOOLEAN); // To convert a string to boolean in JavaScript, the code is as follows −Example Live Demo<!DOCTYPE html>