Print :
This function displays output on browse and returns value true if output is printed successfully, otherwise it returns false.
Example
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<?php $a= print”codelack”; Print”<br>”; Print $a; // returns either true or false. ?> |
Output: codelack<br/>1
Echo:
- It is same as print but it does not return any value so that its performance is faster than print function.
- We can also print multiple statements with an echo function.
Example
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<?php Echo "codelack", "com","tutorial" ; ?> |
Output: codelackcomtutorial.
var-dump:
using this function we can display the value of variable along with data types.
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<?php $k=100; $y="codelack"; Var_dump($k); Var_dump($y); ?> |
Output: int (100) string 8 codelack
Printf:-
Using this function we can print variables with the help of format specifiers.
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<?php $k=100; $h="codelack”; Printf(“%d”,$k); Printf(“%s”,$h); ?> |
Output : 100 codelack
Print_r:
Using this function, we can display all elements of array and properties of object.
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<?php $arr=array(10,20,40,50); Print_r($arr); ?> |
Output: array
[0]=10
[1]=20
[3]=40
[4]=50
NOTE : On viewing the source code , the array is shown systematically on the screen.