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$value = "123";
if (is_numeric($value)) {
echo "The value is numeric.";
} else {
echo "The value is not numeric.";
}
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//is_numeric — Finds whether a variable is a number or a numeric string
is_numeric ( $variable ); // returns true or false
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<?php
$values = array(23, "23", 23.5, "23.5", null, true, false);
foreach ($values as $value) {
echo "is_int(";
var_export($value);
echo ") = ";
var_dump(is_int($value));
}
?>
/* Output
is_int(23) = bool(true)
is_int('23') = bool(false)
is_int(23.5) = bool(false)
is_int('23.5') = bool(false)
is_int(NULL) = bool(false)
is_int(true) = bool(false)
is_int(false) = bool(false)
*/