Php Keywords : Php में कुछ Predefined Words होते हैं जिन्हे हम Keywords कहते हैं, इन Keywords का काम पहले से ही Define होता हैं
हम इन Keywords के नाम के variables , constant variables, namespaces , class names , traits etc. नहीं बना सकते है , क्योकि अगर हम ऐसा करेंगे तो हमारे द्वारा बनाये गए Variable और Actual Keyword में Confusion Create हो जाएगी और Program में Errors आएँगी।
For ex.
<?php
class First
{
function __construct()
{
echo 'Hello Constructor';
}
}
// make new object of the class
new First();
?> 
जैसा की आप देख रहें मैंने echo-and-print.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।
List Of PHP Keywords
| Keyword | Description |
| abstract | Declare a class as abstract |
| and | A logical operator |
| as | Used in the foreach loop |
| break | Break out of loops and switch statements |
| callable | A data type which can be executed as a function |
| case | Used in the switch conditional |
| catch | Used in the try..catch statement |
| class | Declare a class |
| clone | Create a copy of an object |
| const | Define a class constant |
| continue | Jump to the next iteration of a loop |
| declare | Set directives for a block of code |
| default | Used in the switch statement |
| do | Create a do…while loop< |
| echo | Output text |
| else | Used in conditional statements |
| elseif | Used in conditional statements |
| empty | Check if an expression is empty |
| enddeclare | End a declare block |
| endfor | End a for block |
| endforeach | End a foreach block |
| endif | End an if or elseif block |
| endswitch | End a switch block |
| endwhile | End a while block |
| extends | Extends a class or interface |
| final | Declare a class, property or method as final |
| finally | Used in the try…catch statement |
| fn | Declare an arrow function |
| for | Create a for loop |
| foreach | Create a foreach loop |
| function | Create a function |
| global | Import variables from the global scope |
| goto | Jump to a line of code |
| if | Create a conditional statement |
| implements | Implement an interface |
| include | Embed code from another file |
| include_once | Embed code from another file |
| instanceof | Test an object’s class |
| insteadof | Resolve conflicts with traits |
| interface | Declare an interface |
| isset | Check if a variable exists and is not null |
| list | Assigns array elements into variables |
| namespace | Declares a namespace |
| new | Creates an object |
| or | A logical operator |
| Output text | |
| private | Declare a property, method or constant as private |
| protected | Declare a property, method or constant as protected |
| public | Declare a property, method or constant as public |
| require | Embed code from another file |
| require_once | Embed code from another file |
| return | Exit a function and return a value |
| static | Declare a property or method as static |
| switch | Create a switch block |
| throw | Throw an exception |
| trait | Declare a trait |
| try | Create a try…catch structure |
| unset | Delete a variable or array element |
| use | Use a namespace |
| var | Declare a variable |
| while | Create a while loop or end a do…while loop |
| xor | A logical operator |
| yield | Used in generator functions |
| yield from | Used in generator functions |
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