Logo

PHP boolval() Function

PHP boolval() Function

The boolval() function in PHP is used to give the Boolean value for a given variable.

Syntax

boolval ( mixed $var )

Parameter

var(required)- This parameter represents the value that is converted to a boolean. It can be a string type, integer type etc.

Return

This function returns the boolean value for the parameter var. The Boolean value is evaluated based on the following conditions:

  • if $var is evaluated to boolean true it will return TRUE.
  • if $var is evaluated to boolean false it will return FALSE.

Example 1

Output

0.0 will return:      false
12  will return:      true
0   will return:      false

Example 2

Output

4.2 will return :      true
""  will return :      false

Example 3

Output

"PHP": true
"10":  true
"11":  true

Example 4

Output

[11, 12]:   true
[]      :   false
stdClass:   true

Related Topics

PHP array_map() Function

PHP array_map() Function The array_map() function  in PHP is used to return an array containing the results of applying the user-defined callback function over the elements of one or more arrays. Syntax array_map ( callable $callback , array $array1 [, array $... ] )  Parameter callable(required)- This parameter...

1 minute read.

PHP array_intersect_uassoc() function

The array_intersect_uassoc () function in PHP is used to compute the intersection of arrays with the help of an additional index check, comparing indexes by a callable function. It returns an array containing...

1 minute read.

PHP str_word_count() Function

PHP str_word_count() Function The str_word_count() function in PHP counts the number of words inside the string and returns the information about words used in a string. String str_word_count( string $string [, int $format [, string $charlist ]] ) Parameter string(required)- This parameter represents the input string. format(required)- This parameterspecifies the...

2 minutes read.

PHP strstr() Function

PHP strstr() Function The strstr() function in PHP finds the first occurrence of a string. It returns part of the parameter haystack string starting from and including the first occurrence of needle to the end of the haystack parameter. This function is case-sensitive.  Syntax strstr ( string $haystack , mixed $needle [, bool $before_needle] )  Parameter  haystack(required)-...

2 minutes read.

PHP strnatcmp() Function

PHP strnatcmp() Function The strnatcmp() function in PHP compares two strings using a "natural" algorithm. It is case-sensitive. Syntax strnatcmp ( string $str1 , string $str2 ) Parameter str1(required)- This parameter represents the first string. str2(required)- This parameter represents the second string. Return This function returns a value less than(...

1 minute read.

PHP list() Function

PHP list() Function The list() function in PHP sorts an array by key while maintaining the keys. Syntax list ( mixed $var1 [, mixed $... ] ) Parameter var1(required)- This parameter accepts variables separated by spaces. …(optional)- This parameter accepts a list of variables separated...

1 minute read.

PHP convert_uuencode() Function

PHP convert_uuencode() Function The convert_uuencode() function in PHP is used to encode a string and returns the uuencoded data. Syntax convert_uuencode ( string $data ) Parameter data(required)- This parameter represents the data to be encoded. Return This function returns the uuencoded data or FALSE on failure. Example 1 <?php //...

2 minutes read.

PHP array_pad() Function

PHP array_pad() Function The array_pad() function in PHP pads the array to the given length and value and returns a copy of the array padded to size and value specified by size and value parameter. The padding takes place as...

1 minute read.

PHP echo() Function

PHP echo() Function The echo() function in PHP outputs or displays one or more strings. The major differences between print() function and echo() function is that echo accepts an argument list and doesn't have a return value. Also, it is slightly...

1 minute read.

PHP str_getcsv() Function

PHP str_getcsv() Function The str_getcsv() function in PHP parses a CSV string into an array and returns an array containing the fields read. Syntax str_getcsv ( string $input [, string $delimiter [, string $enclosure [, string$escape ]]] ) Parameter input(required)- This parameter represents the string to parse. delimiter(optional)- This parameter signifies...

1 minute read.

PHP is_countable() Function

The PHP is_countable() function in PHP is used to  find whether a variable is countable or not. It returns a Boolean value true if the parameter var is countable else it returns false. Syntax is_countable ( mixed...

1 minute read.

PHP Example

We can create a simple program by writing the source code inside the php tag and save it with .php extension. Syntax: <?php // your code here ?> Let us take an example of PHP. <!DOCTYPE html> <html> <head>            ...

1 minute read.

PHP pos() Function

PHP pos() Function The pos() function in PHP returns the current element in an array which is initialized to the first element of the array. This function is an alias of current(). Syntax pos ( array...

1 minute read.

PHP sprintf() Function

PHP sprintf() Function The sprintf() function in PHP is used to write a formatted string to a variable and returns a formatted string. PHP 4 and above versions support the sprintf() function. The related functions are...

8 minutes read.

PHP For loop with Example

For loop in PHP : The for loop is the most potent loop, it combines the abilities to set up variables as we enter the loop, test for conditions while iterating...

3 minutes read.

PHP convert_uudecode() Function

PHP convert_uudecode() Function The convert_uudecode() function in PHP decodes a uuencoded string. Syntax convert_uudecode ( string $data ) Parameter data- This parameter represents the uuencoded data. Return This function returns the decoded data as a string or FALSE on failure. Example 1 <?php // initializing the string $str...

1 minute read.

PHP is_numeric() Function

The is_numeric() function in PHP finds whether the specified variable is a number or a numeric string. It returns a Boolean value TRUE if the specified var is a number or a numeric string else it returns FALSE otherwise. Syntax is_numeric ( mixed...

1 minute read.

PHP is_float() Function

The PHP is_float() function in PHP is used to  find whether the type of the specified variable is a float or not. It returns a Boolean value true if the parameter var is...

1 minute read.

PHP array_intersect_key() function

The array_intersect_key () function in PHP is used to compute the intersection of arrays using keys for comparison. It returns an array containing all the entries from array1 which have keys that are present in...

1 minute read.

PHP trim() Function

PHP trim() Function The trim() Function in PHP strips the whitespace or other characters from the beginning and the end of the given string. The trim() function strips the following characters: " " - an ordinary space."\t"- a tab."\n"- a new...

1 minute read.