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bool is_string ( mixed $var )

<?php
if (is_string("2663"))
    echo 'This is a string.' . PHP_EOL;
else
    echo 'This is not a string.';
var_dump(is_string('XYZ'));
var_dump(is_string("99"));
var_dump(is_string(123.05));
var_dump(is_string(false));
?>

This is a string.
bool(true)
bool(true)
bool(false)
bool(false)