PHP debugging and code interpretation

PHP debugging and code annotation 1. debugging PHP debugging is different from Java1. common debugging methods: echo & nbsp; output one or more strings var_dump () & nbsp; & nbsp; only suitable for printing variables and small data count () & nbsp; & nbsp; array PHP debugging and code comments

I. debugging
PHP debugging is different from Java

1. common debugging methods:

Echo outputs one or more strings

Var_dump () is only suitable for printing variables and small data.

Count () array length ------- suitable for printing large amounts of data (such as arrays), only the number of outputs
Strlen () string length

Print_r () can print values of complex types of variables (such as arrays and objects)

It should also be used in combination with exit.


2. add debugging

Error_reporting (E_ALL );

II. code comments
Use/* {*/and/*} */to close or open a block of code through zc and zo.