douqiao7958 2014-07-23 15:42
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如何在PHP中修剪数组中的空格

I'm trying to parse a CSV file and as part of it I would like to remove leading/trailing whitespace from all of my cells. Since it's a CSV file it's formatted like a 2D array. Initially I tried:

foreach($csv as $row){
    foreach($row as $cell){
        $cell = trim($cell);
    }
}

However the result was untrimmed.

Next I tried using array_map as suggested here.

$csv = array_map('trim', $csv);

This gave me back an array of empty rows. So I also tried

foreach($csv as $row){
    $row = array_map('trim', $row);
}

Which like my first attempt didn't change anything.

Here's the CSV data I'm using as my input:

First Name,Last Name,Contact Method,Phone, Email John,Doe,Email,1-XXX-XXX-XXXX, john@example.com Jane,Doe,Phone Call,1-XXX-XXX-XXXX,jane@example.com

In particular I was trying to get my script to trim the leading space in the last cell of the first row (" Email" => "Email").

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  • duanjia2415 2014-07-23 15:48
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    You are not modifying the original array when you do the trim. You should get the values by reference in the foreach loop.

    foreach($csv as &$row){
        foreach($row as &$cell){
            $cell = trim($cell);
        }
    }
    

    From the documentation:

    In order to be able to directly modify array elements within the loop precede $value with &. In that case the value will be assigned by reference.

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