is_string
(PHP 4, PHP 5, PHP 7)
is_string — Find whether the type of a variable is string
Description
bool is_string ( mixed $var )Finds whether the type given variable is string.
Parameters
var
The variable being evaluated.
Return Values
Returns TRUE if var is of type string, FALSE otherwise.
Examples
Example #1 is_string() example
<?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_float() - Finds whether the type of a variable is float
- is_int() - Find whether the type of a variable is integer
- is_bool() - Finds out whether a variable is a boolean
- is_object() - Finds whether a variable is an object
- is_array() - Finds whether a variable is an array
← is_scalar
isset →
? 1997–2017 The PHP Documentation GroupLicensed under the Creative Commons Attribution License v3.0 or later.
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