PHP Keywords In Hindi

📔 : PHP 🔗

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PHP keywords , PHP में predefined कुछ words होते जिनका कुछ मतलब होता है। और इन words / keywords के नाम के variables , constant variables, namespaces , class names , traits etc. हम नहीं बना सकते है , क्योंकि इससे हमरे द्वारा बनाए गए variables और actual keywords में confusion होती है , इसलिए हम इन्हे define नहीं कर सकते हैं। और अगर हम ऐसा करते भी है तो error आएगी।

For Example :


<?php         
   class ECHO {
	function __construct()
	{
		echo 'Hello Constructor';
	}
 } 
 // make new object of the class
 new ECHO(); 
?>

Output :

 Parse error: syntax error, unexpected 'ECHO' (T_ECHO), expecting identifier (T_STRING) in C:\xampp\htdocs\test\test.php on line 2

जैसा की आप देख रहें मैंने test.php नाम की एक file बनायीं जिसमे मैंने ECHO नाम की class बनाकर उसका Object बनाने की कोशिश की जिससे Constructor में value को print किया जा सके। हालाँकि हम जानते है की ECHO हम किसी variable को print करने के लिए use करते हैं, इसलिए हमें Error प्राप्त हुई।

इसलिए जब हम किसी project पर काम करे तो हमें यह बात ध्यान में रखनी चाहिए की variables , constant variables, namespaces , class names , traits etc. के नाम meaningful होने चाहिए , और जो PHP के predefined keywords के साथ match न करें , जिससे हमारे Code को समझने और Error Handling में आसानी हो सके।

PHP Keywords

PHP में keywords नीचे define किये गए हैं।

Keyword Name	Uses
abstract	To define abstract class
echo / echo() / ECHO / ECHO	To print value assigned in a variable
print / print() / PRINT / PRINT	To print formatted value assigned in a variable
array()	To define array
and	Uses as a Logical operators
as	Works with foreach loop
break	To break structure of the given loop (For loop or While loop)
case	Works with Switch
catch	Handles Errors
class	Defines a class
clone	Makes clone object of a object
const	Define constant variable in a class
continue	To skip the structure at a specified condition in a loop (for loop or while loop)
die	Exit the script execution and equivalent to exit
exit	Exit the script execution and equivalent to die
do	Works with While loop . Execute the script then check condition .
if	Executes if given condition is true.
else	Works with if statement , execute if condition is not satisfied.
else if	Works with if statement , execute if upper condition is not satisfied.
empty	Checks if a variable has a value or not.
endif	Tells where if-else loop getting end.
foreach	To iterate the array variable.
endforeach	Tells where foreach loop getting end.
for	Iterate the loop of given
endswitch	Tells where switch loop getting end.
endwhile	Tells where while loop getting end.
extends	To inherit a class
final	Define a final method. Which prevents child classes from overriding that method.
finally	Works with Try block . Finally block runs every time .
function	To define a function .
global	To define a global variable.
goto	goto operator can be used to jump to another section in the program.
implemets	Tells that a class implementing a interface
include	Include a another file in current file.
include_once	Includes a file only once
interface	To define a interface
instanceof	Determines whether a PHP variable is an instantiated object of a certain class.
isset()	Checks whether a variable defiened or not.
namespace	To Define a namespace .
new	Uses to cerate a object of a class.
or	Logical Operator.
private	To define a private variables or functions in a class.
protected	To define a protected variables or functions in a class.
public	To define a public variables or functions in a class.
require	Includes a file , also produce the fatal error if file not exists.
require_once	Includes a file only once , also produce the fatal error if file not exists.
static	To define static properties in a class.
switch	To define /start switch loop.
trait	To define a trait .
try	Handels the exception
unset()	Unset a given variable
var	To define a variable with public visibility in a class.
while	To Define / start while loop.
__LINE__	Current line number
__FILE__	Returns the full file path with file name.
__DIR__	Returns the directory of the.
__FUNCTION__	Returns the function name or {closure} for anonymous functions.
__CLASS__	Returns the class name.
__TRAIT__	Returns the trait name that may include namespace.
__METHOD__	Returns the method name .
__NAMESPACE__	Returns the namespace name

I Hope अब आप keywords को अच्छी तरह से समझ गए होंगे। इसके अलावा PHP हमें कुछ Magic Constants भी provide करतीं है जिनका result उनके use किये गए स्थान के accordingly change होता रहता है।

PHP Keywords In Hindi

PHP Keywords

Related Topics :

Rahul Kumar

PHP Keywords In Hindi

PHP Keywords

Related Topics :

Rahul Kumar

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