What are the output functions of php
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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.
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