PHPクイックエントリー-基本構文およびオブジェクト向け

sublimeの構成

{
    "cmd": ["php", "$file"],
    "file_regex": "php$",
    "selector": "source.php"
}

コードインスタンス

  
echo "hello world"

#     
//     
/*
        
*/
?>

基礎文法

 

//       :                          
// PHP           ($)
//     
$name = "Tom";
echo $name;

//         
$detail = "
this is first line
this is second line
";

echo $detail;


//     
$a = 20;

function global_func(){
    // print($a);  // Undefined variable
    global $a;  //       
    print($a);  // 20
    $GLOBALS['a'] += 30;  //       
    echo "
";
}

global_func();
print($a);  // 50
echo "
";


//     
function static_func(){
    static $a = 1;
    echo "a=";
    echo $a;
    echo "
";
    $a += 1;
}

static_func();  // a=1
static_func();  // a=2
static_func();  // a=3


//     
define("MAX", 20);

//     
print MAX;  // 20
print "
";

print(constant("MAX"));  // 20
print "
";


// PHP      == ===（       ） <> !=   !==(        )
?>

 
//     
if (1 < 2){
    print("1<2");
}
else{
    print("1>=2");
}
print "
";
// 1<2


//     

//  4   ：for、while、do...while、foreach，  3  C     
for($i=1; $i<=3; $i++){
    print($i);
    print "
";
}
// 1 2 3 

$i = 1;
while ($i<=3) {
    print $i;
    print " ";
    $i++;
}
print "
";
// 1 2 3

do{
    print $i;
    print " ";
    $i--;
} while($i>0);
print "
";
// 4 3 2 1

//     ，     
$list = array(1, 2, 3, 4, 5);
foreach ($list as $value) {
    print "value = $value ";
}
print "
";
// value = 1 value = 2 value = 3 value = 4 value = 5 


//    3 
//     
$numbers = array(1, 2, 3, 4, 5);
foreach ($numbers as $value) {
    print("$value ");
}
print "
";
// 1 2 3 4 5

//       
$numbers[0] = "one";
$numbers[1] = "two";
$numbers[2] = "three";

foreach ($numbers as $value) {
    print("$value ");
}
print "
";
// one two three 4 5

//     
$names[0] = 1;
$names[2] = 2;
foreach ($names as $value) {
    print("$value ");
}
print "
";
// 1 2 


//       
$length = count($numbers);
for($i=0; $i<$length; $i++){
    print($numbers[$i]);
    print(" ");
}
print "
";
// one two three 4 5 


//      PHP 5.5.36，    python   
$people = ["Tom"=>"20", "Jack"=>"30", "Jimi"=>"40"];

//       
print($people["Tom"]);
print(" ");
print($people["Jack"]);
print(" ");
print($people["Jimi"]);
print("
");
// 20 30 40

//       
$people["Tom"] = 50;
$people["Jack"] = 60;
$people["Jimi"] = 70;

//       
foreach ($people as $key => $value) {
    print("$key=>$value
");
}
print("
");
// Tom=>50
// Jack=>60
// Jimi=>70


//     
$cars = array(
    "first" => [
        "name" => "car1", 
        "color" => "white"
    ],
    "second" => [
        "name" => "car2",
        "color" => "black"
    ]);

//         
print($cars["first"]["name"]);  # car1
print("
");


// PHP      
/*
sort() -          
rsort() -          
asort() -         ，         
ksort() -         ，         
arsort() -         ，         
krsort() -         ，         
*/


//    
//                   
//                   

//         (.)：          
$a = "hello";
$b = "world";
print($a . " " . $b);  // hello world
print("
");

//         
$c = "  ";
print(strlen($a));  // 5
print(strlen($c));  // 6

//      
print(strpos($a, "ll")); // 2
print(strpos($a, "xx")); // FALSE
print("
");

//   
// $a    ， &$b    ， $c     
function func_args($a, &$b, $c=2){
    $a += 1;
    $b += 1;
    $c += 1;
    print("a=$a b=$b c=$c
"); // a=2 b=2 c=3
    return $a;  //    
}

$args_a = 1;
$args_b = 1;

$ret = func_args($args_a, $args_b);
print("ret=$ret
");  // ret=2

print("args_a=$args_a args_b=$args_b
");
// args_a=1 args_b=2
?>

オブジェクト向け

 

//    PHP      

/*
    
public（  ）：                。
protected（   ）：                        。
private（  ）：                   。
*/
//           ，   ，    ,      , var   ，      
// Final    
//        final，          。
//           final，      。

class Father{
    public $name = "Tom";
    protected $age = 40;
    private $address = "  ";

    function print_info(){
        print("public name: " . $this->name . "
");
        print("protected age: " . $this->age . "
");
        print("private address: " . $this->address . "
");
    }

    final function work(){
        print("   ，   ，       
");
    }
}

//       
class Child extends Father{
    protected $age = 20;  //      protected  

    function print_info(){
        print("public name: " . $this->name . "
");
        print("protected age: " . $this->age . "
");
        // print("private address: " . $this->address . "
"); // Undefined property
    }

    // function work(){
    //     print("         
");
    // }  
    // Cannot override final method
}

$father = new Father();
$father->print_info();
/*
public name: Tom
protected age: 40
private address:   
*/

$child = new Child();
$child->print_info();
/*
public name: Tom
protected age: 20
*/



//          

class People{
    function __construct($name){
        $this->name = $name;
        print("       " . $this->name);
    }

    function __destruct(){
        print("      ");
    }
}

class Human extends People{
    function __construct($name){
        parent::__construct($name);  //          
        print("       " . $this->name);
    }
}

$people = new People("  ");
print("
");
/*
         
      
*/

$human = new Human("  ");
print("
");
//                          


//   
//              ，               
//                 ，       
//          

interface ISleep{
    public function sleep($time);
}

interface IEat{
    public function eat();
}

//      
class Dog implements ISleep, IEat{
    public function sleep($time){
        print("sleep... time: $time
");
    }
    public function eat(){
        print("eating ...
");
    }
}

$dog = new Dog();
$dog->sleep(5);
$dog->eat();
/*
sleep... time: 5
eating ...
*/

//    

//      ，                    ，               。
//              。
//           ，                

abstract class AbsBase{

    //     
    abstract public function sleep();

    //     
    public function eat(){
        print("eat...
");
    }

}

class Cat extends AbsBase{
    public function sleep(){
        print("cat sleep...
");
    }
}

class Pig extends AbsBase{
    public function sleep(){
        print("pig sleep...
");
    }
}

// $abs = new AbsBase(); // Cannot instantiate abstract class

$cat = new Cat();
$cat->eat();  // eat...
$cat->sleep();  // cat sleep...

$pig = new Pig();
$pig->eat();  // eat...
$pig->sleep();  // pig sleep...


//      static
//           

class Foo{
    public static $name = "static name";

    public function get_name(){
        print(self::$name);  //                 
        print("
");
    }
}

print(Foo::$name);  // static name  //            

$foo = new Foo();
$foo->get_name();  // static name


?>

参考PHPクイックエントリー