What are the functions for removing spaces in php?

php functions to remove spaces include: 1. Function [trim($arr)] removes spaces on both sides; 2. Function [preg_replace()] regular matching to remove all spaces, the code is [preg_replace('# # ','',$goodid)].

php functions to remove spaces are:

1. Remove spaces on both sides

　　trim($arr)

2. Regular matching removes all spaces

　　preg_replace('# #','',$goodid)

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