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    <p>Here's what I do.</p> <ol> <li>Parse the first 5 lines of a CSV file</li> <li>Count the number of delimiters [commas, tabs, semicolons and colons] in each line</li> <li>Compare the number of delimiters in each line. If you have a properly formatted CSV, then one of the delimiter counts will match in each row.</li> </ol> <p>This will not work 100% of the time, but it is a decent starting point. At minimum, it will reduce the number of possible delimiters (making it easier for your users to select the correct delimiter).</p> <pre><code>/* Rearrange this array to change the search priority of delimiters */ $delimiters = array('tab' =&gt; "\t", 'comma' =&gt; ",", 'semicolon' =&gt; ";" ); $handle = file( $file ); # Grabs the CSV file, loads into array $line = array(); # Stores the count of delimiters in each row $valid_delimiter = array(); # Stores Valid Delimiters # Count the number of Delimiters in Each Row for ( $i = 1; $i &lt; 6; $i++ ){ foreach ( $delimiters as $key =&gt; $value ){ $line[$key][$i] = count( explode( $value, $handle[$i] ) ) - 1; } } # Compare the Count of Delimiters in Each line foreach ( $line as $delimiter =&gt; $count ){ # Check that the first two values are not 0 if ( $count[1] &gt; 0 and $count[2] &gt; 0 ){ $match = true; $prev_value = ''; foreach ( $count as $value ){ if ( $prev_value != '' ) $match = ( $prev_value == $value and $match == true ) ? true : false; $prev_value = $value; } } else { $match = false; } if ( $match == true ) $valid_delimiter[] = $delimiter; }//foreach # Set Default delimiter to comma $delimiter = ( $valid_delimiter[0] != '' ) ? $valid_delimiter[0] : "comma"; /* !!!! This is good enough for my needs since I have the priority set to "tab" !!!! but you will want to have to user select from the delimiters in $valid_delimiter !!!! if multiple dilimiter counts match */ # The Delimiter for the CSV echo $delimiters[$delimiter]; </code></pre>
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    1. POhow to find out if csv file fields are tab delimited or comma delimited
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