PHP to search text document (.txt), grab entire line and the line number

Thank you for taking the time to read this and I will appreciate every single response no mater the quality of content. :)I'm trying to create a php script which searches a text file for specific text. A person types in the specific text within a HTML form and the php script should search for that specific text within the text file.The value of the input field of the HTML form is "username" and within the php document, the variable "$username" is the entered data, example shown below:\[code\]$username = $_POST['username'];\[/code\]The text file below is called "rank_order.txt":\[quote\] 7 AULLAH1 13 SupremeGamer 13 AULLAH1 15 abc123\[/quote\]If a person types into the HTML form "AULLAH1", I'd like the php script to grab the first "AULLAH1" entry in the text file (e.g. It should grab the first line and not the thrid, as the first line is the first entry to contain the text "AULLAH1"). Also with that, when a person types in a specific text, it shouldn't simply grab the document or the text, it should grab the whole line: "7 AULLAH1" and place it into a php variable, maybe something like "$grabbed"? If possible at all.Also with that, if it grabs the data from line 3, could a php variable represent line 3? If the data is grabbed from line 23, again could a php variable represent line 23 (and if it's grabbed from line 1, could a php variable hold the number 1? etc...)All assistance is appreciated and I look forward to your replies; thank you. :) If I didn't explain anything clearly and/or you'd like me to explain in more detail, please reply. :)Thank you.
 
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