Provides several ways to replace newline characters with PHP

Source: Internet
Author: User
Tags php form
    1. ? $str = "This is a test \ n";
    2. $patten = Array ("\ n", "\ n", "\ R");
    3. ?//replace \ r \ n First, then presence \ n
    4. $str =str_replace ($order, "", $str);
    5. ?>
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    1. PHP has three ways to solve

    2. 1. Use Str_replace to replace line breaks
    3. $str = Str_replace (Array ("\ r \ n", "\ r", "\ n"), "", $str);

    4. 2. Use regular replacement

    5. $str = preg_replace ('//s*/', ' ', $str);

    6. 3. Use PHP-defined variables (recommended)

    7. $str = Str_replace (Php_eol, ", $STR);
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    1. /*
    2. * Get the user's operating system line break, \ n
    3. * @access Public
    4. * @return String
    5. */
    6. function Get_crlf ()
    7. {
    8. if (Stristr ($_server[' http_user_agent '), ' Win ')
    9. {
    10. $the _crlf = ' \ r \ n ';
    11. }
    12. ElseIf (Stristr ($_server[' http_user_agent '), ' Mac ')
    13. {
    14. $the _crlf = ' \ r '; For-old MAC OS
    15. }
    16. Else
    17. {
    18. $the _crlf = ' \ n ';//The right to be significant
    19. }
    20. return $the _crlf;
    21. }
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Note: When the foreground page is displayed, use NL2BR to change the line to

The second example illustrates:

Find an interesting thing to do:

    1. $text = "AAAA

    2. CCC ";

    3. $text =str_replace (' \ n ', "", $text);

    4. $text =str_replace (' \ R ', "", $text);
    5. $text =str_replace (' \ r \ n ', ' ", $text);

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Normally, the above code should be able to replace line breaks, but in fact it is not. Very depressed, tried many times, is not working. Finally, change to this:

    1. $text =str_replace ("\ n", "", $text);
    2. $text =str_replace ("\ R", "", $text);
    3. $text =str_replace ("\ r \ n", "", $text);
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Incredibly on it, the original is double quotes, single quotation mark problem!

Double quotation marks than single quote efficiency almost, because the double quotation marks in the process of PHP parsing, will also determine whether there are variables, single quotation marks will not have this judgment, so generally speaking, no variables involved in the case, I would use single quotation marks, did not expect this time to replace the newline character, with single quotation mark incredibly not

Finally written:

    1. $order = Array ("\ n", "\ n", "\ R");
    2. $replace = ";
    3. $text =str_replace ($order, $replace, $text);
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This allows you to replace the line break. is not very convenient.

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