In summary, if you wanted to see how to remove non-printable characters from strings in PHP, I hope these examples are helpful.What to append if $text needs to be trimmed. The trim () function removes whitespace and any other predefined characters from both ends of a string. $result = preg_replace('/]/', "", $string) Summary , " ' ? ! :Īs shown in my earlier example, you actually need to use two brackets with these regex patterns when using preg_replace: Any alphanumeric character 0 to 9 OR A to Z or a to z. Definition and Usage The trim () function removes whitespace and other predefined characters from both sides of a string. As the ârangeâ name implies, these patterns can be used to match ranges of characters in PHP strings: More PHP regular expressionsįinally, while Iâm in the neighborhood, hereâs a list of PHP ârangeâ regular expressions from the php.net regex page. If you do need to handle Unicode characters, this SO page shows a possible solution. More solutions (Unicode)Īs I mentioned, I donât currently have to concern myself with Unicode characters, so the original ASCII character solution I showed works fine for me. Note that if you just echo out the original string, it prints fine: Top Source File: wp-includes/formatting.php. Default: null Top Return string Trimmed text. I donât know why that regex ends up putting ? characters in the resulting string, so at the moment Iâm calling this a âpossible solutionâ rather than a solution. Default: 55 more string Optional What to append if text needs to be trimmed. Per the PHP regex doc, the regex stands for âany printable character,â so for my example I thought it would leave the â and â characters in the resulting string, but to my surprise the output looks like this: ( This page is a good resource for basic octal and hex values.) Possible solution: Use the 'print' regexĪnother possible solution is to use the âprintâ regular expression shown in this example with preg_replace: trim() : This function will remove spaces, extra tabs and new lines from both ends of strings that are passed as arguments to it. Examples Example 1 Usage example of trim () $result = preg_replace('//', '', $string) Īs you can see, the characters â and â are not in the $result string. Florida blasted for its Black history curriculum: 'They want to replace history with lies' 02:00 Florida's 2023 Social Studies curriculum will include lessons on how 'slaves developed skills' that. In this example I just want to get rid of the characters â and â, which donât work well in my current application: ltrim () and rtrim () are used to remove these whitespaces or other characters from the left and right sides of the string. Hereâs the syntax of the trim () function: trim ( string string, string characters ' \r\t\v\0' ) : string Code language: PHP (php) The trim () function has two parameters: string is the input string that will be trimmed. You can see how this works in the interactive PHP shell. What does the PHP trim () function do The trim () function in PHP removes whitespace or any other predefined character from both the left and right sides of a string. The trim () function removes the whitespaces or other characters from the beginning and end of a string. That code removes any characters in the hex ranges 0-31 and 128-255, leaving only the hex characters 32-127 in the resulting string, which I call $result in this example. $result = preg_replace('//', '', $string) LTRIM(), Remove leading spaces MAKESET(), Return a set of comma-separated strings that have the corresponding bit in bits set MATCH(), Perform full-text. That can be done with this preg_replace code: Solution: Allow only ASCII charactersįor my purposes I donât have to work with Unicode characters, so one of the best solutions for my purposes is to strip all non-ASCII characters from the input string. I donât know of any built-in PHP functions to remove all non-printable characters from a string, so the solution is to use the preg_replace function with an appropriate regular expression. PHP FAQ: How do I remove all non-printable characters from a string in PHP?
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