In PHP, you can judge numbers, characters, objects, arrays, and so on, including those functions such as see Is_bool (), Is_int (), Is_integer (), Is_float (), Is_real (), Is_object (), and Is_array (). I don't know how much you know. - - Double Precision number judgment
Is_double Is_double-alias of Is_float () Description This function is an alias function for Is_float ().
The code is as follows $Temperature = 15.23; if (is_double ($Temperature)) { Print ("Temperature is a double".) <br> "); }
Integer judgment
Is_integer-alias of Is_int () and Is_long () Description This function is an alias function for Is_int ().
The code is as follows $PageCount = 2234; if (Is_integer ($PageCount)) { Print ("$PageCount is an integer".) <br> "); }
Object judgment
Is_object--Detects whether a variable is an object Description BOOL Is_object (mixed Var)
Returns TRUE if Var is an object, or FALSE.
The code is as follows Class Widget { var $name; var $length; } $thing = new Widget; if (Is_object ($thing)) { Print ("thing is an object".) <br> "); }
Character judgment
Is_string--Detects whether a variable is a string Description BOOL Is_string (mixed Var)
Returns TRUE if Var is string, or FALSE.
The code is as follows $Greeting = "www.hzhuti.com"; if (is_string ($Greeting)) { Print ("Greeting is a string".) <br> "); }
Is_numeric--Detects whether a variable is a numeric or numeric string Description BOOL Is_numeric (mixed Var)
Returns TRUE if Var is a numeric and numeric string, or FALSE.
The code is as follows $int = 1; if (Is_numeric ($int)) { Print ("This is a real number, pure man".) <br> "); }
Okay this article here is simply about the PHP object, the number, the character Judge function, the difficulty relatively super simple.
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