Php (7) PHP functions

1. a UDF is a code block that can be executed when needed. Function declaration: all functions use the keyword & quot; function () & quot; to start naming functions. the function name should prompt its function. The function name must start with a letter or underscore. Add & quot; {& quot; 1. a UDF is a code block that can be executed when needed. Function declaration: all functions use the keyword "function ()" to start naming the function. the function name should prompt its function. The function name must start with a letter or underscore. Add "{"-the section after the opening curly braces is the function code. Insert the function code to add a "}"-the function ends by closing curly braces. Example: [php] 2. function-adding parameters our first function is a very simple function. It can only output one static string. You can add parameters to add more functions to the function. The parameter is similar to a variable. Example: [php] ";}Echo" My name is "; writeMyName (" lin "); echo" My name is "; writeMyName (" kobe "); echo" My name is "; writeMyName ("John");?>3. function-return value functions can also be used to return values. [Php] Output of the above code: 4 + 26 = 30