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Learn how to effectively check if a URL contains specific text using PHP, with detailed examples and solutions to common mistakes.
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This video is based on the question https://stackoverflow.com/q/70087423/ asked by the user 'Michal Kovalčík' ( https://stackoverflow.com/u/2929021/ ) and on the answer https://stackoverflow.com/a/70087582/ provided by the user 'user2246924' ( https://stackoverflow.com/u/2246924/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Check if a String Contains a Specific Word in PHP

When working with strings in programming, especially URLs, you may often encounter situations where you need to verify if a particular word or phrase is present. In this guide, we'll explore how to implement a PHP function that checks if a URL contains specific terms, highlight common mistakes, and provide a clear solution.

Understanding the Problem

You have a URL string and you want to determine if it contains certain keywords: for instance, "amazon.de" or "brickset.com". Depending on what you find, you want to return a specific string if the keyword is found, or indicate that the URL doesn't contain any of the specified terms. Here’s the intended logic:

If the URL contains "amazon.de", return "amazon".

If the URL contains "brickset.com", return "brickset".

If neither is found, return "no URL".

However, a common issue arises during the coding process that can lead to unexpected behavior. Let’s break down the provided code and identify what needs to be fixed.

Original Code Analysis

Here’s the code snippet you might have used:

[[See Video to Reveal this Text or Code Snippet]]

Issues in the Code

Missing Quotation Mark:

The line echo "amazon; should be correctly enclosed with quotes.

Return vs. Echo:

If the intention is to return values from the function, use return 'string'; instead of echo 'string';.

Use of if vs. else if:

The second condition should be checked with else if to prevent the function from echoing 'no URL' after finding a match.

Proposed Solution

Let’s modify the original function to correct these mistakes and better meet the requirements:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Corrected Code

String Matching: We utilize str_contains() to check if the string exists within the given URL.

Returning Values: Each condition returns a string if found, rather than printing it out. This allows for proper function processing and can be used elsewhere in your application.

Logical Flow: Implementing else if means if one condition is met, the function won't evaluate the others unnecessarily and will prevent returning 'no URL' if any matches are found.

Conclusion

By establishing a clear structure to check for specific words in a string, you can effectively manage URL validation in your PHP applications. Always be mindful of syntax rules like quotation marks and the importance of logical flows in condition checks. This not only makes your code cleaner but prevents common errors that can lead to confusion.

Remember, debugging is part of the learning process, and improving your logic will enhance your programming skills significantly!

Now you have the tools to efficiently verify if a string contains a specific word. Happy coding!