PHP Comparison Operator

 Comparison Operator

 Note: - 

                        php me comparison karte hain to value false hone par output blank(space) aata hain. 

 Aur comparison sahi hone par output ke roop me one (1) print hota hain. 

•    Double equal sign (==): - 

•                    double equal sign (==) se value barabar ho to wah 1 aur blank ke roop me (jo dikhai hi nahi deta hain)  output ko show karta hain .
• Esme Data Type Equal nahi hone par bhi output jo aayega sahi hi aayega , kyonki esme value ke match hone se matlab hota hain.

• 
  

• Triple Equal sign (===): -

         esme  'a' ki value jo hain 'b' ke barabar ho sath hi unke data type bhi equal hone chahiye . 

Tabhi Output jo aayega sahi rahega. 

 

• 
  

                          

Example:- 

Double Equal sign 

    <?php

         $a = 10;

          $b = 10;

           echo $a == $b;

?> 

Output:- 1.

Example:- 

Double Equal sign 

    <?php

         $a = 10;

          $b = "10";   #yah jo hai string type ka data type me change ho 

gaya hain jiske karan output nahi show hoga.

           echo $a === $b;

?> 

Output:-    //(kuch nahi print hoga).

Not equal (!=):-

 esme not equal sign ke hone se value jab barabar nahi hoti hain tab output eska true yani '1 ' print hoga. 

Less than Greater Than (< >): -

es sign ko lagaane par value chhota ho ya bada dono me se koi ek match hone par Output true (1) print hoga.

 Not + double equal sign (!==): -

Esme to value barbar hi na ho aur sath me data type bhi barabar nahi hona chahiye.

 Ye criteria follow kare tabhi Output true (1) print hoga.

 Greater than (>): -

  esme agar 'a' ki value 'b' se bada ho tab hi output 1 print hoga .

 agar condition false ho to output me kuch nahi show hoga . 

Ex-            

Greater than Equal to (>=): -

esme  'a'  ki value bade hone ke sath barabar ho tabhi output true (1) print hoga.

Less than Equal to (<=): -

           Esme 'a' ki value dono condition follow karta hain to output jo hain true (1) print hoga .

Spaceship (<=>): -

Esme 'a' ki value jo hain 'b' se chhoti hogi to Ouput jo hain -1 aayega .

Agar 'a' ki value 'b' ke barabar hoga to Answer aayega zero (0) 

Tatha  'a' ki value 'b' se badi hone par output jo hain 1 print hoga .

 ex-