is_scalar
PHP function
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(PHP 4 >= 4.0.5, PHP 5, PHP 7, PHP 8)
Finds whether a variable is a scalar
Description
is_scalar(mixed $value): bool
Finds whether an expression is evaluated as a scalar value.
See scalar types for more information.
Note
is_scalar() does not consider resource type values to be scalar as resources are abstract datatypes which are currently based on integers. This implementation detail should not be relied upon, as it may change.
Note
is_scalar() does not consider NULL to be scalar.
Parameters
valueThe variable being evaluated.
Return Values
Returns true if value is a scalar, false otherwise.
Examples
is_scalar() example
php
<?php
function show_var($var)
{
if (is_scalar($var)) {
echo $var, PHP_EOL;
} else {
var_dump($var);
}
}
$pi = 3.1416;
$proteins = array("hemoglobin", "cytochrome c oxidase", "ferredoxin");
show_var($pi);
show_var($proteins)
?>The above example will output:
output
3.1416
array(3) {
[0]=>
string(10) "hemoglobin"
[1]=>
string(20) "cytochrome c oxidase"
[2]=>
string(10) "ferredoxin"
}