How php forces a value to a numeric type
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Conversion method: 1, in front of the variable enclosed in parentheses with the target type "(int)", syntax "(int) $val"; 2, the use of intval () function, syntax "intval ($val)"; 3, the use of settype (), syntax "settype ($val," integer ")".
Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer
Php forces values to be numeric
Method 1: add the target type "(int)" or "(integer)" enclosed in parentheses before the variable to be converted
Method 2: use the specific conversion function intval ()
The intval () function is used to get the integer value of a variable.
The intval () function returns the integer value of the variable var by using the specified binary base conversion (the default is decimal). Intval () cannot be used for object, otherwise an E_NOTICE error will be generated and 1 will be returned.
Method 3: use the settype () function
Description:
The settype () function sets the variable $var to the specified $type type. Syntax:
Settype ($var, $type)
The value that can be set for $type:
"boolean" (or "bool", starting with PHP 4.2.0)
"integer" (or "int", starting with PHP 4.2.0)
"float" (available only after PHP 4.2.0, "double" used in older versions is now disabled)
"string"
"array"
"object"
"null" (since PHP 4.2.0)
The settype () function changes the type of the variable itself.
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