Multiple processes in PHP

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I've written a program that uses \[code\]fsockopen()\[/code\] and \[code\]fgets()\[/code\] to read a website's content on the net or downloading a file onto my server from the net.It uses the \[code\]While\[/code\] command to receive headers. The problem is: when the script is processing \[code\]While\[/code\], a unique client can not request another page on my website and it will wait until \[code\]While()\[/code\] finishes its processing.Is there any way to solve this problem?