Why should var_dump be used for PHP link output? Why should I use the & nbsp; var_dump variable to output the PHP link? ------ Solution ------------------ because var_dump can view all php Data types: scalar, resource, array, and PHP link, why should var_dump be used for output?
Why should var_dump be used for PHP link output?
------ Solution --------------------
Because var_dump can view all php Data types:
Scalar, resource, array, and object.
Mysql_query returns a resource type, which cannot be viewed using echo, print, and print_r.
------ Solution --------------------
Echo, print_r, and var_dump:
Echo outputs the string and value. it is not a function and has no return value.
Print_r prints a composite type, such as an array object.
Var_dump displays the structure information about one or more expressions, including the expression type and value. The array recursively expands the value and displays its structure through indentation.
I was confused at the beginning and now I understand it.
