FILTER_VALIDATE_FLOAT

$price=12.32; // Change this value to get different result
if(filter_var($price,FILTER_VALIDATE_FLOAT)){
echo " Yes validation passed ";
}else{
echo " No validation failed ";
}

if(filter_var($price,259)){

Difference between FILTER_VALIDATE_FLOAT and FILTER_VALIDATE_INT

$var=12.34;
if(filter_var($var, FILTER_VALIDATE_FLOAT)){
echo "Yes true for FILTER_VALIDATE_FLOAT: $var";
}else{
echo "No false FILTER_VALIDATE_FLOAT: $var";
}

Yes true for FILTER_VALIDATE_FLOAT: 12.34

$var=12.34;
if(filter_var($var, FILTER_VALIDATE_INT)){
echo "Yes true for FILTER_VALIDATE_INT: $var";
}else{
echo "No false FILTER_VALIDATE_INT: $var";
}

No false FILTER_VALIDATE_INT: 12.34

Maximum and minimum range

$price=12.32; // Change this value to get different result
if(filter_var($price,FILTER_VALIDATE_FLOAT,
	["options" => ["max_range" => 13.2,"min_range"=>11.2]])){
echo " Yes validation passed ";
}else{
echo " No validation failed ";
}

Yes validation passed

Example : Validating and Sanitizing a Float Input

This example demonstrates how to validate and sanitize a float value:

$input = "23.45abc";
$sanitized_input = filter_var($input, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
if (filter_var($sanitized_input, FILTER_VALIDATE_FLOAT)) {
    echo "Valid float: " . $sanitized_input;
} else {
    echo "Invalid float.";
}

Example : Handling Scientific Notation in Float Validation

You can also validate scientific notation using FILTER_VALIDATE_FLOAT:

$input = "4.56e2";
if (filter_var($input, FILTER_VALIDATE_FLOAT)) {
    echo "Valid float in scientific notation.";
} else {
    echo "Invalid float.";
}