is_scalar


php128 apg

CHECKS whether a VARIABLE is SCALAR.

This function returns a BOOLEAN value when it tests the following VARIABLE types:

STRING, NUMERIC, BOOLEAN, ARRAY, NULL, RESOURCE or OBJECT.


SCALAR

is a VARIABLE which consists of one of the types:

STRING, INTEGER, FLOAT or BOOLEAN.



<?php

bool is_scalar ( mix $var );


where,

$var = VARIABLE to test

?>

$var


The VARIABLE to test.





To make it easier to recognize whether a variable is SCALAR, we will use a user-defined function that can be seen below:



<?php

   function isscalar($arg) 
            { 
            $type = is_scalar($arg); 
            { 
                        if($type == TRUE) 
                        // statement 1 
                        {
                    var_dump($arg);
                        echo  '<br>( is SCALAR )<br>'; 
                        }
                        else 
                        // statement 2 
                        {
                    var_dump($arg);
                        echo '<br>( is NOT SCALAR )<br>'; 
                        }
                        } 
                        }
                        
where,

$arg = ARGUMENT to test

?> 

  1 EXERCISE   

<?php

function isscalar($var) 
{ 
$type = is_scalar($var); 
{ 
if($type == TRUE) 
// statement 1 
{
var_dump($var);
echo  '<br>( is SCALAR )<br><br>'; 
}
else 
// statement 2 
{
var_dump($var);
echo '<br>( is NOT SCALAR )<br><br>'; 
}
} 
}

$var01a = $_SERVER['REMOTE_ADDR'];

$var01b = $_SERVER['HTTP_USER_AGENT'];

$var01c = $_SERVER['HTTP_ACCEPT_LANGUAGE'];

$var01d = M_E;

$var01e = 1.6e-19; 

$var01f = [ 'c' => 299792458, 'G' => 6.67428E-11 ]; 

$var01g = NULL;

$var01h = true;

isscalar($var01a);
isscalar($var01d);
isscalar($var01e);
isscalar($var01f);
isscalar($var01g);
isscalar($var01h);

?>

 RESULT   

string(3) "::1"
( is SCALAR )

float(2.718281828459)
( is SCALAR )

float(1.6E-19)
( is SCALAR )

array(2) { ["c"]=> int(299792458) ["G"]=> float(6.67428E-11) }
( is NOT SCALAR )

NULL
( is NOT SCALAR )

bool(true)
( is SCALAR )

Note that some floating point values ​​are presented differently in PHP versions 7.4.XX and 8.0.XX