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Boolean functions

is_email​

Alias: isEmail

Check if the given string is valid email address

is_email(string)

is_empty​

Check if the given variable is empty

is_empty(string)

is_url​

Check if the given variable/string is a valid URL

is_url(string)

is_numeric​

Check if the given variable/string is of numeric value

is_numeric(value)

is_json​

Check if the given variable/string is a valid JSON

is_json(value)

is_int​

Check if the given variable is an integer

is_int(value)

is_float​

Check if the given variable is a float

is_float(value)