PHP data types and judgment variable types

PHP data types include: string, integer, floating point number, Boolean, array, object, NULL.

How to determine the variable type, use the var_dump function.
The var_dump function is to determine the type and length of a variable and output the value of the variable. If the variable has a value, it will lose the value of the variable and return the data type.

Java code

$val1 = 1;

$val2 = 3.14;

$val3 = 'Who reads it and asks you to recite it, the water falls and the fragrance floats. ';

$val4 = array('aaa','bbb');

$val5 = true;

$val6 = function(){};

$val7 = null;

var_dump($val1) ;//Integer

echo '
';

var_dump($val2);//Floating point number

echo '
';

var_dump($val3);//String

echo '
';

var_dump($val4);//Array

echo '
';

var_dump($val5);//Boolean

echo '
';

var_dump($val6);//Object

echo '
';

var_dump($val7);//NULL

?>

Rendering:

PS: Since the encoding used is UTF-8, each Chinese character takes up 3 bytes, while English Each character occupies 1 byte.