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    <pre><code>//EMPTY array to hold each line on domains that has a match $matches = array(); //for each line on the domains file foreach($domains as $domain){ //for each keyword foreach($keywords as $keyword){ //if the domain line contains the keyword on any position no matter the case if(preg_match("/$keyword/i", $domain)) { //Add the domain line to the matches array $matches[] = $domain; } } } </code></pre> <p>Now you have the $matches array with all the lines of the domain file that match the keywords</p> <p><em><strong></em> NOTE THAT WITH THE PREVIOUS APPROACH THE TWO ENTIRE FILES ARE LOADED INTO MEMORY AND DEPENDING ON THE FILE SIZES YOU CAN RUN OUT OF MEMORY OR THE OS WILL START USING THE SWAP WHICH IS MUCH SLOWER THAN RAM</strong></p> <p>THIS IS ANOTHER AND MORE EFFICIENT APPROACH THAT WILL LOAD ONE LINE IF THE FILE AT THE TIME.</p> <pre><code>&lt;?php // Allow automatic detection of line endings ini_set('auto_detect_line_endings',true); //Array that will hold the lines that match $matches = array(); //Opening the two files on read mode $domains_handle = fopen('../../domains.txt', "r"); $keywords_handle = fopen('../../keywords.txt', "r"); //Iterate the domains one line at the time while (($domains_line = fgets($domains_handle)) !== false) { //For each line on the domains file, iterate the kwywords file a line at the time while (($keywords_line = fgets($keywords_handle)) !== false) { //remove any whitespace or new line from the beginning or the end of string $trimmed_keyword = trim($keywords_line); //Check if the domain line contains the keyword on any position // using case insensitive comparison if(preg_match("/$trimmed_keyword/i", trim($domains_line))) { //Add the domain line to the matches array $matches[] = $domains_line; } } //Set the pointer to the beginning of the keywords file rewind($keywords_handle); } //Release the resources fclose($domains_handle); fclose($keywords_handle); var_dump($matches); </code></pre>
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    1. POHow would I compare two text files for matches with PHP
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    1. USslash28cu
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    1. POHow would I compare two text files for matches with PHP
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    1. COThis seems to work, but when I run top on my server it's 99% CPU usage for my VPS. Is there a way to clear memory for each line?
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      1. USCodingNoob
    2. COyes. The thing is that when you use the function file(), the whole files are loaded into memory and that takes a lot of memory. My suggestion is not to use the. file() function. use fopen() and fread() instead. this functions do not load the whole file. I will post an example when arrive to my work.
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    3. CO@IsaacBoda I edited the answer and wrote a more efficient script that don't load the entire file. Read line by line.
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