(PHP 4, PHP 5, PHP 7)
Find whether the type of a variable is string
bool is_string ( mixed $var )
Finds whether the type given variable is string.
Parameters:
var
The variable being evaluated.
Returns:
Returns TRUE
if var
is of type string, FALSE
otherwise.
Examples:
is_string() example
1 2 3 4 5 6 7 8 9 | <?php $values = array (false, true, null, 'abc' , '23' , 23, '23.5' , 23.5, '' , ' ' , '0' , 0); foreach ( $values as $value ) { echo "is_string(" ; var_export( $value ); echo ") = " ; echo var_dump( is_string ( $value )); } ?> |
The above example will output:
is_string(false) = bool(false) is_string(true) = bool(false) is_string(NULL) = bool(false) is_string('abc') = bool(true) is_string('23') = bool(true) is_string(23) = bool(false) is_string('23.5') = bool(true) is_string(23.5) = bool(false) is_string('') = bool(true) is_string(' ') = bool(true) is_string('0') = bool(true) is_string(0) = bool(false)
See also:
is_int() -
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