How to remove invisible spaces from a string in php?

Question

PHP

After importing a CSV file generated in 1C, for some reason the values ​​are saved as strings starting with a space "0212903322". Using trim does not change the situation. The CSV file is utf8 encoded. What could be the problem?

Answer 1

In the notorious BOM, of course.
For any problems with "invisible" characters, you should use urlencode ()
after it displays something like %EF%BB%BF in place of invisible characters, stupidly replace percentages with slashes, and cut from the beginning of the line

if(substr($str, 0, 3) == "\xEF\xBB\xBF") {
    $str = substr($str, 3);
}

Answer 2

ak_wi ,
Many programs add the bytes 0xEF, 0xBB, 0xBF to the beginning of any document saved as UTF-8. This is a Unicode Byte Order Mark (BOM) mark, and it is also often called a signature (respectively, UTF-8 and UTF-8 with Signature).

/**
 * Удалить BOM из строки
 * @param string $str - исходная строка
 * @return string $str - строка без BOM
 */
function removeBOM($str="") {
    if(substr($str, 0, 3) == pack('CCC', 0xef, 0xbb, 0xbf)) {
        $str = substr($str, 3);
    }
    return $str;
}

// Строка, например, полученная при помощи file_get_contents()
$str = 'Строка с BOM';
 
// Строка без BOM
$str = removeBOM($str);
 
echo $str;

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