PHP Filters & Filter Functions Validating A Number Is A Float
Example
Validates value as float, and converts to float on success.
var_dump(filter_var(1, FILTER_VALIDATE_FLOAT));
var_dump(filter_var(1.0, FILTER_VALIDATE_FLOAT));
var_dump(filter_var(1.0000, FILTER_VALIDATE_FLOAT));
var_dump(filter_var(1.00001, FILTER_VALIDATE_FLOAT));
var_dump(filter_var('1', FILTER_VALIDATE_FLOAT));
var_dump(filter_var('1.0', FILTER_VALIDATE_FLOAT));
var_dump(filter_var('1.0000', FILTER_VALIDATE_FLOAT));
var_dump(filter_var('1.00001', FILTER_VALIDATE_FLOAT));
var_dump(filter_var('1,000', FILTER_VALIDATE_FLOAT));
var_dump(filter_var('1,000.0', FILTER_VALIDATE_FLOAT));
var_dump(filter_var('1,000.0000', FILTER_VALIDATE_FLOAT));
var_dump(filter_var('1,000.00001', FILTER_VALIDATE_FLOAT));
var_dump(filter_var(1, FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var(1.0, FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var(1.0000, FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var(1.00001, FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var('1', FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var('1.0', FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var('1.0000', FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var('1.00001', FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var('1,000', FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var('1,000.0', FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var('1,000.0000', FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
var_dump(filter_var('1,000.00001', FILTER_VALIDATE_FLOAT, FILTER_FLAG_ALLOW_THOUSAND));
Results
float(1)
float(1)
float(1)
float(1.00001)
float(1)
float(1)
float(1)
float(1.00001)
bool(false)
bool(false)
bool(false)
bool(false)
float(1)
float(1)
float(1)
float(1.00001)
float(1)
float(1)
float(1)
float(1.00001)
float(1000)
float(1000)
float(1000)
float(1000.00001)
