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Introduction to debugging php with gdb gdb is a code debugging tool for c language

There are four main forms of gdb that can be used to debug php, python, mysql, etc.: after startup, use the attach pid tracker gdb [options] [executable-file [core-file or process-id]] gdb [options]-- args executable-file [inferior-arguments.] gdb [options] [--python |-P] script-file [script-arguments.] Common debug command attach pid

Example: if you debug mysql code to a trace

1. First find mysql to ID:10111.

two。 Then attach 10111 to track mysql

Layout

Show source code / assembly instructions

Layout names are: src: Displays source and command windows. Show the source code asm: Displays disassembly and command windows. Display assembly instructions split: Displays source, disassembly and command windows. Display source code and assembly instruction regs: Displays register window. If existing layout is source/command or assembly/command, the register window is displayed. If the source/assembly/command (split) is displayed, the register window is displayed with the window that has current logical focusbreak

B increase breakpoint

Info b displays breakpoint information

Delete num deletes the specified breakpoint

Continue [num]

C num executes to num breakpoints, num can be left empty = 1 by default

Next [num]

When n num executes to the following num line, num can be left empty with default = 1 and will not enter inside the function.

Step [num]

S num executes to the following num line, num can be left empty with default = 1, and does not enter inside the function.

Backtrace

Bt views the current call stack

Print [value]

P value prints variable information

Help

Help layout to see how commands are used

Debug php code 1. Add a new php file

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