Things to note when using the strpos() function when learning PHP

The main content of this article is about the precautions for using the strpos() function in PHP. Interested friends can learn about it!

Returns the first position where the character appears. If the character is at the beginning of the searched string, '0' will be returned

Therefore, when using this function to determine whether the string contains a certain Characters are used:

if(strpos('string','str') !== false){ 
   // ...          
   }

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