php basics-constants-variable related basic functions
Comment statement
//Single line
# Single line
/*
Multi-line comments
*/
/**
* Documentation comments
*
*/
Constant definition
Custom constants constant names are case-sensitive
The system's magic constants are not case-sensitive __DIR__ __dir__
Variable definition
Variable names are case sensitive
When declaring a variable name, start with the $ symbol and comply with the naming rules for variable names
$i;
var_dump($i);
$i = 'ok';
var_dump($i);
$i = "Hello";
var_dump($i);
$i = 20;
var_dump($i);
$i = 20.5;
var_dump($i);
//Variable type is similar to javascript variable type, it is a variant type
$i = true;
var_dump($i);
Function name, class name, case-insensitive
PHP basic functions
phpinfo();
var_dump($i);
echo gettype($i);
define('AGE',200);
defined('AGE');
realpath()
dirname();
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