The Top 9 Most Popular PHP String Functions – vegibit
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php - How to query an array of data that has a Single quote? - Stack Overflow
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I can confirm that the single vs. double quotes myth is really just a myth. A... - DEV Community
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Single quotes vs double quotes in PHP (plus how to do multi-line strings using heredocs and nowdocs) - YouTube
Remove Quotes from String in PHP - Java2Blog
differences between the single and double quotes in PHP
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Intro to PHP & Variables - ppt download
The Difference Between Double and Single Quotes in PHP - SkillForge
