What to do if php trim doesn’t work

Solution for php trim not working: first trim accepts parameters in reverse order; then set the string for masking characters from the beginning and end of the string; finally use str_replace function with empty replacement string That’s it.

Recommended: "PHP Video Tutorial"

Specific questions:

Why doesn't my php trim() function work?

I'm trying to use trim to remove the underline characters from the data returned to the $_post array. I tried using

 $post_Value= str_replace("_", " ", $key)

but the text doesn't seem to be returned as a string. There is a break between each entrance. Then I tried trimming like this:

  $value)
    {
    $str = $str . $key . ",";
    }
   $post_Value = trim("_", $str);
   }
   $query = "UPDATE player_match SET categoryOption='$$post_Value' WHERE id=1";
 ?>

When I use the trim function, nothing happens, it doesn't remove the _ characters. My ultimate goal is to put the comma separated list into the database as a single string. Why doesn't my trim() function work in this case?

Update: 076402276aae5dbec7f672f8f4e5cc81 was found in the view page resource, so I had to do a combination of the following:

 $post_Value= str_replace("", "", $str);
        $post_Value2= str_replace("_", " ", $post_Value);
        $post_Value3= rtrim($post_Value2,",submit,");
        echo $post_Value3;
        $query="UPDATE player_match SET categoryOption='$post_Value3' WHERE   id=1";

Workaround:

First, trim() accepts parameters in reverse order: $str, then $character_mask. So you should use: $post_Value = trim($str, "_");

Secondly, trim() only sets the string for masking characters from the beginning and end of the string. If the string is surrounded by non-shielded characters, no masking characters are removed from the string.

Actually, you should use str_replace() with an empty replacement string (you tried using a single space as the replacement):

$post_Value= str_replace("_", "", $key)

If you also want to remove the 0c6dc11e160d3b678d68754cc175188a tag (In its typical variation), this can be done with a single str_replace() call, like this:

$post_Value= str_replace(array("_", "
", "
", "
"), "", $key)

The above is the detailed content of What to do if php trim doesn’t work. For more information, please follow other related articles on the PHP Chinese website!