php - 检查字符串是否包含浮点数

Question

What is the easiest way to check if a string contains a valid float?

For example

is_string_float("1") = true
is_string_float("1.234") = true
is_string_float("1.2e3") = true
is_string_float("1b2") = false
is_string_float("aldhjsfb") = false

Answer 1

The easiest way would be to use built in function is_float(). To test if a variable is a number or a numeric string you must use is_numeric().