키워드는 어떤 의미를 담고 있는 단어입니다. 일반적인 PHP 언어 사용에서는 이러한 단어를 상수, 변수 이름, 메소드 이름, 클래스 이름 등으로 사용할 수 없습니다. 이러한 키워드를 사용하면 PHP가 자동으로 이해합니다. 이러한 PHP 키워드는 변수 이름과 함께 사용될 때 실제 키워드와 혼동될 수 있습니다. 따라서 이러한 키워드를 변수 이름으로 사용해서는 안됩니다.
광고 이 카테고리에서 인기 있는 강좌 PHP 개발자 - 전문 분야 | 8개 코스 시리즈 | 3가지 모의고사무료 소프트웨어 개발 과정 시작
웹 개발, 프로그래밍 언어, 소프트웨어 테스팅 등
다음은 목록입니다:
코드:
<?php //example to demonstrate abstract keyword abstract class Program { abstract protected function MethodOne(); public function display() { echo '<br>'.$this->MethodOne(); } } class ProgramOne extends Program { protected function MethodOne() { echo '<br>'.'In MethodOne'; } } $objOne = new ProgramOne; $objOne->display(); ?>,
출력:
코드 :
<?php //example to demonstrate and keyword $a = 10; $b = 11; if($a ==10 and $b == 11) { echo 'Result : True'; } else { echo 'Result : False'; } ?>
출력:
코드:
<?php //example to demonstrate array keyword $directions = array("e" => "east", "w" => "west", "n" => "north", "s" => "south"); print_r($directions); ?>
출력:
코드:
<?php //example to demonstrate array keyword $directions = array("e" => "east", "w" => "west", "n" => "north", "s" => "south"); foreach($directions as $key=>$value) { echo '<br>'. $key. '=>'.$value; } ?>
출력:
코드 :
<?php //use of break keyword without optional argument $arr = array("water", "sky", "try", "sand"); foreach($arr as $key=>$value) { if($value == 'try') { break ; // can use break 1 also } echo '<br>'.$value; } ?>
출력:
코드:
<?php //example to demonstrate case keyword $i = 1; while($i<5) { switch($i) { case 1: echo "<br>"."One"; break; case 2: echo "<br>"."Two"; break; case 3: echo "<br>"."Three"; break; default: echo "<br>"."Default"; } $i++; } ?>
출력:
코드:
<?php //example to demonstrate catch keyword function Operation() { try { $num1 = 10; $num2 = 0; if($num1 / $num2) { throw new Exception('Divide By Zero'); } } catch (Exception $e) { die($e->getMessage()); } } Operation(); ?>
출력:
코드:
<?php //example to demonstrate class keyword class ClassOne{ var $str = 'Hello World'; public function displayMethod() { echo $this->str; } } $obj = new ClassOne; $obj->displayMethod(); ?>
출력:
const 키워드는 아래와 같이 할당 연산자를 사용하여 값으로 이름을 정의하는 데 사용됩니다
상수 나이= 29;
일반 변수처럼 상수 이름 앞에 $ 기호가 없습니다.
코드:
<?php // example to demonstrate default keyword $fruits = 'Cherries'; switch ($fruits) { case 'Apple': echo "Apple"; break; case 'Banana': echo "Banana"; break; case 'Papaya': echo "Papaya"; break; default: echo "Fruit is not Apple, Banana or Papaya "; break; } ?>
출력 :
코드:
<?php // example to demonstrate do keyword $x = 2; do { if($x > 2) { echo 'x is greater than 2'; } else{ echo 'x is less than 2'; } } while ($x < 2); ?>
출력:
코드 :
<?php //example to demonstrate die keyword $conn = mysqli_connect('localhost','root','','dbname'); if(!$conn) { die("Unable to connect "); } ?>
출력:
코드:
<?php // example to demonstrate echo keyword echo 'Hello! '; $name = 'John Doe'; echo 'My name is '. $name; ?>
출력:
코드:
<?php // example to demonstrate else keyword $a = 10; if ($a > 5) { echo "a is greater than 10"; } else { echo "a is not greater than 10"; } ?>
출력:
코드:
<?php // example to demonstrate elseif keyword $a = 10; if ($a > 10) { echo "a is greater than 10"; } elseif ($a == 10) { echo "a is equal to 10"; } else { echo "a is smaller than 10"; } ?>
출력 :
코드:
<?php // example to demonstrate empty keyword $str = 'Hello World!'; if(empty($str)) { echo 'Variable is empty'; } else { echo $str; } ?>
출력:
코드:
<?php // example to demonstrate endfor keyword for($i=0;$i<5;$i++) : echo "<br/>".$i; endfor; ?>
출력:
코드 :
<?php // example to demonstrate endif keyword if ($a > 10): echo "a is greater than 10"; elseif ($a >10) : echo "a is equal to 10"; else: echo "a is not equal to 10"; endif; ?>
출력:
코드:
<?php // example to demonstrate endforeach keyword $arr = array(1,2,3,4,5,6,7,8,9,10); foreach ($arr as $key=>$value): echo '<br>'.$value; endforeach; ?>
출력:
코드:
<?php // example to demonstrate endswitch keyword $fruits = 'Cherries'; switch ($fruits): case 'Apple': echo "Apple"; break; case 'Banana': echo "Banana"; break; case 'Papaya': echo "Papaya"; break; default: echo "Fruit is not Apple, Banana or Papaya "; break; endswitch; ?>
출력:
코드:
<?php // example to demonstrate endwhile keyword $i = 0; while($i<5): echo "<br>".$i; $i++; endwhile; ?>
출력:
Code:
<?php //example to demonstrate eval keyword $string1 = 'World'; $string2 = 'John Doe'; $string = 'Hello $string1 . My name is $string2'; echo "<br>".$string; eval("\$string = \"$string\";"); echo "<br>".$string; ?>
Output:
This keyword when encountered in a script, terminates the execution of the script.
Code:
<?php //example to demonstrate extends keyword class ParentClass { var $string = 'PHP'; public function display() { echo $this->string; } } class ExtendClass extends ParentClass { public function display() { echo 'Hello World!'; } } $obj1 = new ExtendClass; $obj1->display(); ?>
Output:
Code:
<?php //example to demonstrate final keyword class ParentClass { var $string = 'PHP'; final public function display() { echo $this->string; } } class ExtendClass extends ParentClass { public function display() { echo 'Hello World!'; } } $obj1 = new ExtendClass; $obj1->display(); ?>
Output :
Code:
<?php //example to demonstrate catch keyword try { $num1 = 10; $num2 = 0; if($num1 / $num2) { throw new Exception('Divide By Zero'); } } catch (Exception $e) { echo '<br>'.$e->getMessage(); } ?>
Output:
Code:
<?php // example to demonstrate for keyword for($i=0; $i<10; $i++) { if($i == 5) { break; } echo '<br>'.$i; } ?>
Output :
Code:
<?php // example to demonstrate foreach keyword $array = array(10,20,30,40,50); foreach($array as $value) { echo '<br>'.$value/10; } ?>
Output:
Code:
<?php function calSum($a , $b) { $c = $a + $b; return $c; } $result = calSum(10 , 20); echo '<br> The sum : '.$result; ?>
Output:
Code:
<?php //example to demonstrate global keyword $a = 10; $b = 20; function fun() { global $a; global $b; $result = $a + $b; return $result; } $f = fun(); echo 'The result is '.$f; ?>
Output:
Code:
<?php // example to demonstrate if keyword $sum = 10; if($sum == 10) { echo 'Sum is 10'; } else { echo 'Sum is not 10'; } ?>
Output:
Code:
<?php //example to demonstrate interface keyword interface One { public function first(); } class MainClass implements One { public function first() { echo 'This is the First function'; } } $obj = new MainClass; echo $obj->first(); ?>
Output :
Code:
file.php
<?php //example to demonstrate include keyword $a = 'The Earth'; $b = 'Round'; ?>
index.php
<?php include 'file.php'; echo $a . ' is '. $b. ' in Shape'; ?>
Code:
file.php
<?php //example to demonstrate include_once keyword $a = 'The Earth'; $b = 'Round'; ?>
index.php
<?php Include_once 'file.php'; echo $a . ' is '. $b. ' in Shape'; ?>
Output:
Code:
<?php //example to demonstrate instanceOf keyword class MainClass { public function MainCLassMethod(){ echo 'Hello World!'; } } class ExtendedClass extends MainClass { public function ExtendedClassMethod(){ echo 'Have a Nice Day!'; } } $obj1 = new ExtendedClass; var_dump($obj1 instanceOf ExtendedClass); ?>
Output:
Code:
<?php //example to demonstrate interface keyword interface One { public function one(); } interface Two { public function two(); } class MainClass implements One, Two { public function one() { echo '<br> This is the one function'; } public function two() { echo '<br> This is the two function'; } } $obj = new MainClass; echo $obj->one(); echo $obj->two(); ?>
Output:
Code:
<?php //example to demonstrate isset keyword $stringOne = ''; var_dump(isset($stringOne)); $stringTwo = NULL; var_dump(isset($stringTwo)); ?>
Output :
Code:
<?php //example to demonstrate list keyword $names = array('Ram','Mohan','Raghav'); list($person1, $person2, $person3) = $names; echo "$person1, $person2 and $person3 are friends"; ?>
Output:
Code:
<?php //example to demonstrate new keyword class Student { public function score($name, $subject, $marks) { echo "$name scored $marks marks in $subject"; } } $obj = new Student; $obj->score('Sunil','Maths',90); ?>
Output:
Code:
<?php //example to demonstrate or keyword $a = 10; $b = 11; if($a ==10 or $b == 12) { echo 'Result : True'; } else { echo 'Result : False'; } ?>
Output :
Code:
<?php //example to demonstrate print keyword $str = "PHP Programming"; print($str); $stringOne = "Shyam, "; $stringTwo = "How are you?"; print "<br>"."Hello $stringOne $stringTwo"; ?>
Output :
Code:
<?php //example to demonstrate private keyword class MainClass { private $str = 'Private'; function PrivateMethod() { echo 'In '. $this->str. ' Method'; } } $obj = new MainClass(); $obj->PrivateMethod(); //Shows Private Method ?>
Output:
Code:
<?php //example to demonstrate public keyword class MainClass { public $str = 'Public'; function PublicMethod() { echo 'In '. $this->str. ' Method'; } } $obj = new MainClass(); $obj->PublicMethod(); //Shows Public Method ?>
Output:
Code:
<?php //example to demonstrate protected keyword class MainClass { protected $str = 'Protected'; function ProtectedMethod() { echo 'In '. $this->str. ' Method'; } } $obj = new MainClass(); $obj->ProtectedMethod(); //Shows Protected Method ?>
Output:
Code:
<?php //example to demonstrate return keyword function sum() { $a = 10; $b = 20; $c = $a +$b; return $c; } $result = sum(); echo 'Sum : ' . $result; ?>
Output:
Code:
<?php //example to demonstrate switch keyword $i= 3; switch($i) { case 1: echo "<br>"."One"; break; case 2: echo "<br>"."Two"; break; case 3: echo "<br>"."Three"; break; default: echo "<br>"."Default"; } ?>
Output:
Code:
<?php //example to demonstrate throw keyword function division($x, $y) { try { if($y == 0) { throw new Exception('Divide By Zero'); } } catch (Exception $e) { echo '<br>'.$e->getMessage(); } } division(10,0); ?>
Output:
Code:
<?php //example to demonstrate try keyword try{ $arr = array(); $arr_length = count($arr); if($arr_length == 0) { throw new Exception('Error : Empty Array!'); } else { echo 'Array found'; print_r($arr); } } catch(Exception $e) { echo '<br>'.$e->getMessage(); } ?>
Output:
Code:
<?php //example to demonstrate unset keyword echo 'Hello World!'.'<br>'; $a = 10; echo $a; unset($a); // echo $a; //this line when uncommented shows error : Undefined variable, as the variable is unset ?>
Output:
Code:
<?php //example to demonstrate var keyword class MainClass { var $str = 'PHP Programming'; public function displayMsg() { echo $this->str; } } $obj = new MainClass; $obj->displayMsg(); ?>
Output:
Code:
<?php //example to demonstrate while keyword $i = 0; while ($i<10) { echo '<br>'. $i; $i++; } ?>
Output:
In this article, you will learn about keywords in PHP with examples. These examples explain the usage of each of the keyword in PHP.
위 내용은 PHP 키워드의 상세 내용입니다. 자세한 내용은 PHP 중국어 웹사이트의 기타 관련 기사를 참조하세요!