Types Of Output Function In PHP

Output functions are used to display text on web page. The different types of output functions are given below.

1. print:  This function is used to display the output on the browser and return value as true if output is printed successfully or it returns false.
   <?php
   $rv=print “Webnoid”;
   print $rv;
   ?>
2. Echo: This function is same as print function but it doesn’t return any value. So it perform faster than print function. We can also print multiple statements with single echo function.
   <?php
   echo “Webnoid”, “Schools”;
   ?>
3. var_dump: This function is used to display value of variables along with data type.
   <?php
   $sno=100;
   $uname= “Webnoid”;
   var_dump($sno);
   var_dump($uname);
   ?>
4. printf: This function is used to display the value along with format specifier.
   <?php
   $sno=100;
   $uname=”Webnoid”;
   printf(“%d”, $sno);
   printf(“%s”, $uname);
   ?>
5. print_r: This function is used to display all elements of array variable and properties of object 
6. isset: This function is used to check whether the variable is set with any value or not 
   <?php
   $no =100;
   echo isset($no);
   ?>
7. unset: This function is used to delete the value of the variable.
   <?php
   $no=100;
   unset($no);
   echo isset($no);
   ?>