The print_r() function is a built-in function in PHP and is used to print or display information stored in a variable.
print_r( $variable, $isStore )
Parameters: This function accepts two parameters as shown in above syntax and described below.
- $variable: This parameter specifies the variable to be printed and is a mandatory parameter.
- $isStore: This an option parameter. This parameter is of boolean type whose default value is FALSE and is used to store the output of the print_r() function in a variable rather than printing it. If this parameter is set to TRUE then the print_r() function will return the output which it is supposed to print.
Return Value: If the $variable is an integer or a float or a string the function prints the value of the variable. If the variable is an array the function prints the array in a format which displays the keys as well as values, a similar notation is used for objects. If the parameter $isStore is set to TRUE then the print_r() function will return a string containing the information which it is supposed to print.
Below programs illustrate the print_r() function:
Welcome to GeeksforGeeks 101 Array (  => Welcome  => to  => GeeksforGeeks )
Array (  => Welcome  => to  => GeeksforGeeks )