Some less commonly used features of PHP

1. Variable function name, you can use string concatenation function name

function aa($str) {
echo $str;}$function = "aa";$function('Hello');// ORcall_user_func($function , $param);

2. List all functions and determine whether a function exists

get_defined_functions()function_exist()

3. Accept PUT requests, PHP REST is required

parse_str(file_get_contents('php ://input'), $put_vars);

4. Parse time from string

echo date('Y-m-d', strtotime('-1 month ago'));

5. DEBUG View Call backtrace

$backtrace = debug_backtrace();var_export($backtrace[0])die();

6. Interactive command line, command line execution PHP

php -a and php -r 'echo "hello ”;'

Please see php -h

7. Memory usage detection

memory_get_peak_usage()memory_get_usage()