How to convert array into string in php

php method to convert an array into a string: first create a PHP sample file; then define an array; then convert the array into a string through the "implode(',',$arr);" method; Finally, the conversion result can be output through echo.

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The code example is as follows:

$arr = array(1,2,3,4,5,6,7);
echo implode(',',$arr);
//结果："1,2,3,4,5,6,7"
echo implode('-',$arr);
//结果："1-2-3-4-5-6-7"

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