How to split a string in PHP -

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I have a long string that results in image file- (in base 64) with a binary file encoding. Should it be followed while dividing a differential method (or rule)?
Edit:
I have to type the string in an XML file, but to do this, I have to divide it into smaller parts. Br> Editing 2: I would like to divide it by length (I think this is more suitable in this case). Thank you

You probably want to take a look, because you do the base 64 encoding (assuming Encoding , because you can not embed decoded base64 data in XML files)


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