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This article mainly explains "what are the output functions of php". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what the output functions of php are.

Php output functions are: 1, echo (), can output string; 2, print (); 3, print_r (); 4, printf (); 5, sprintf (); 6, var_dump (), can output variable content, type or string content, type, length; 7, die ().

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Php output function function description echo () output string print () output one or more strings print_r () print easy-to-understand information about variables printf () output formatted string sprintf () write the formatted string to a variable var_dump () output the content, type, and length of the string die () outputs a message and exits the current script

1 、 echo

Echo () is not really a function, it's a php statement, so you don't need to use parentheses on it. However, if you want to pass more than one parameter to echo (), using parentheses will cause a parsing error. And echo returns void and does not return a value, so you cannot use it to assign values.

2 、 print

Print () is used the same as echo (), but echo is a little faster than print. It's not really a function either, so you don't need to use parentheses on it.

However, if you want to pass more than one parameter to print (), using parentheses will cause a parsing error.

Note that print always returns 1, which is different from echo

That is, you can use print to assign values, but it doesn't make any sense.

5. Sprintf function

This function works in the same way as printf, except that it writes the formatted string to a variable instead of outputting it.

Thank you for your reading, these are the contents of "what are the output functions of php". After the study of this article, I believe you have a deeper understanding of what the output functions of php have, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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