Introduction to IDEs and Debugging

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Introduction to IDEs and Debugging aaronjholbrook.com aaronjholbrook

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get_info( ‘aaronholbrook’ );

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How I Learned to Stop Worrying and Love Interactive Debugging (Also IDEs are the shit)

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How I Learned to Stop Worrying and Love Interactive Debugging (Also IDEs are the shit)

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Integrated Development Environment

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A software application that provides comprehensive facilities to computer programmers for software development

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It is more than a text editor

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Use the right tool for the job

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Jump to a declaration (function, method, variable, etc)

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Visualize version control changes

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See unused variables and syntax errors

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How I Learned to Stop Worrying and Love Interactive Debugging (Also IDEs are the shit)

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How I Learned to Stop Worrying and Love Interactive Debugging (Also IDEs are the shit)

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what IS debugging?

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Debugging is a process of ﬁnding and reducing the number of bugs in a computer program, thus making it behave as expected

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WHY INTERACTIVE DEBUGGING?

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Ever do this?

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echo( $variable );

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print_r( $array ); var_dump( $array );

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public function get_instagram_data( $parameter, $type = null ) { ! var_dump( $parameter ); // Needed to see what parameter was passed ! $access_token = get_option( 'easy_instagram_access_token' ); ! if ( false === $access_token ) return false; ! var_dump( $access_token ); // Was it false? What was it? ! ! . . .

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protected function get_instagram_url( $parameter ) { ! $preg_match = preg_match( '/^(@|#)([a-z]+)/', $parameter, $matches ); var_dump( $preg_match ); // What was the result? var_dump( $matches ); // Any matches? ! if ( ! empty( $preg_match ) ) { ! ! . . .

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var_dump( );

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Well - there IS a better way.

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Follow program execution

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Examine variables at a speciﬁc point of execution

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Achieve a quicker and greater understanding of new code

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HOW TO: INTERACTIVELY DEBUG

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1. USE IDE (Integrated Development Environment)

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG 4. SET BREAKPOINT

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG 4. SET BREAKPOINT 5. LOAD PAGE

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG 4. SET BREAKPOINT 5. LOAD PAGE 6. EXAMINE VARIABLES & WALK THROUGH CODE

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG 4. SET BREAKPOINT 5. LOAD PAGE 6. EXAMINE VARIABLES & WALK THROUGH CODE REPEAT STEPS 4-6 AS NECESSARY

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1. USE IDE (Integrated Development Environment)

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG 4. SET BREAKPOINT

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG 4. SET BREAKPOINT 5. LOAD PAGE

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG 4. SET BREAKPOINT 5. LOAD PAGE 6. EXAMINE VARIABLES & WALK THROUGH CODE

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1. USE IDE (Integrated Development Environment) 2. CONFIGURE 3. ENABLE XDEBUG 4. SET BREAKPOINT 5. LOAD PAGE 6. EXAMINE VARIABLES & WALK THROUGH CODE REPEAT STEPS 4-6 AS NECESSARY

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THE DEBUGGER

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Program Execution

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Show execution point

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Show execution point

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Step over

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Step over

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Step into

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Step into

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Step out

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Step out

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Run to cursor

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Run to cursor

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Program Flow

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Rerun

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Resume

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Stop

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Call Stack

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In computer science, a call stack is a stack data structure that stores information about the active subroutines of a computer program

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Variables

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Contrived Example problem happens on page load

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Real life debugging not seeing correct ad zone in author archive

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Questions?

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Aaron Holbrook THANKS! aaronjholbrook aaronjholbrook.com aaronjholbrook.com/interactive-debugging