Join David Powers for an in-depth discussion in this video Increasing or decreasing a number by one, part of Learning PHP.
- When working with loops to perform repetitive actions,…it's often necessary to keep count…by increasing or decreasing a number by one.…PHP has two special operators designed for this purpose…but they work in a way that can be rather confusing.…Let's focus on adding one to a number.…This is increment.php…which you can find in the chapter 04,…04_03 folder of the Exercise Files.…It begins by initializing number to 5.…
Then on the next line,…number is incremented using the increment operator…that consists of two plus signs.…And there must be no space between the variable…and the operator.…In this particular instance,…the operator has been placed after the variable.…Then we display the value of number…and increment it on line 5 again.…This time though,…the operator is placed in front of the variable.…Again, there must be no space…between the operator and the variable.…
Then on line 6, we display the value of number.…If we load this into a browser,…it shows us the results.…We started off with 5,…incremented by one, we get 6,…
Author
David Powers
Released
11/20/2015- Naming variables
- Storing text as strings
- Doing calculations with PHP
- Using conditional statements to make decisions
- Creating custom functions
- Deciphering error messages
- Emailing the contents of an online form
- Dealing with multiple-choice form fields
Skill Level Beginner
Duration
Views
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Introduction
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Welcome1m 15s
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Using the exercise files4m 14s
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1. Checking Your Setup
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2. PHP Basics
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PHP: The big picture6m 39s
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Comments and white space6m 7s
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Joining strings9m 4s
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3. Making Decisions with Conditional Statements
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The truth according to PHP3m 21s
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Setting a default value8m 52s
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4. Doing Calculations with PHP
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Arithmetic operators9m 15s
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Challenge: Integer division1m 18s
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Solution: Integer division3m 27s
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5. Using Loops for Repetitive Actions
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Using a for loop5m 44s
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Alternative syntax for loops2m 32s
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6. Using Functions and Objects
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Creating custom functions7m 53s
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7. Including External Files
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Using server-side includes3m 32s
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Using include and require8m 16s
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Examining the include_path5m 12s
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8. Handling Errors
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Dealing with PHP errors1m 27s
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9. Emailing the Contents of an Online Form
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Blocking suspect phrases8m 2s
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Preparing to send email5m 10s
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Automating the reply address7m 46s
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Building the message body10m 18s
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Sending the email5m 7s
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Troubleshooting mail()3m 17s
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10. Dealing with Multiple-Choice Form Fields
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Introduction1m 58s
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Handling checkbox groups7m 26s
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Handling select menus6m 21s
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Conclusion
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Where next?1m 56s
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Video: Increasing or decreasing a number by one