What are some common PHP commands and their functions?

One common PHP command is "echo", which is used to output text or variables to the screen. Another common command is "include", which is used to include and evaluate a specific file in the current script. "isset" is another common command used to check if a variable is set and is not NULL. 

// Example of using the "echo" command to output text
echo "Hello, World!";

// Example of using the "include" command to include and evaluate a specific file
include 'header.php';

// Example of using the "isset" command to check if a variable is set
if(isset($name)){
    echo "The variable 'name' is set.";
}

Keywords

PHP commands functions libraries error types syntax

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