Differences between echo (), print (), print_r () and return _ PHP Tutorial

Analyze the differences between echo (), print (), print_r (), and return. What are the differences between echo (), print (), print_r (), and return in PHP? Many new users and friends who do not use print () often fail to answer this question and thus fail the interview. So what are their differences in PHP echo (), print (), print_r (), and return?

Many new users and friends who do not use print () often fail to answer this question and thus fail the interview.

So what are their differences? Let's take a look.

Answer:
Echo is a PHP statement, print and print_r are functions, and the statement does not return values. the function can return values (even if it is not used)
Print () can only print values of simple type variables (such as int and string)
Print_r () can print values of complex types of variables (such as arrays and objects)
The return statement exits from the current function and returns a value from that function.

Echo outputs one or more strings
Echo-output one or more strings
Descr resume ption
Void echo (string arg1 [, string...]) // the returned value is null.
Echo "Hello", "friend ";

Print-output a string
Descr resume ption
Int print (string arg) // The return value is an integer.
Print "your good friend ";

You can perform the following operations:
$ Name = print "nihao/n ";
$ Str = 'Test print value is $ name .';
Eval ("/$ print =/" $ str /";");
Echo $ print;

Print_r-prints easy-to-understand information about variables.
Bool print_r (mixed expression [, bool return]) // The return value is Boolean and the parameter type is mix. it can be a string, an integer, an array, and an object class print_r () displays easy-to-understand information about a variable. If the value is string, integer, or float, the variable value is printed. If array is provided, keys and elements are displayed in a certain format. Objects are similar to arrays.

Note: print_r () will move the array pointer to the last edge.

What are the differences between values (), print (), print_r (), and return? Many new users and friends who do not use print () often fail to answer this question and thus fail the interview. So what are their differences...