Truncate PHP string with a specific delimiter - php

Question

Good morning,
I need to truncate a string with a specific delimiter character.
For example with that string:
myString = 'customname_489494984';
I would like to strip automatically every string parts after "_"
(in this case "489494984").
Is there a function in order to truncate the string part after a specific
delimiter?
Many thanks!
François

Answer 1

You can also use strstr() which finds the first occurrence of a string:
$myString= "customname_489494984";
echo strstr($myString, '_', true);
Here's my reference: http://php.net/manual/en/function.strstr.php

Answer 2

Use a simple combo of substr and strpos:
$myString = 'customname_489494984';
echo substr($myString, 0, strpos($myString, '_'));
BONUS - Wrap it in a custom function:
function truncateStringAfter($string, $delim)
{
return substr($string, 0, strpos($string, $delim));
}
echo truncateStringAfter('customname_489494984', '_');

Answer 3

Try this,It will remove anything after "_".
$string= 'customname_489494984';
$string=substr($string, 0, strrpos($string, '_'));

Answer 4

The problem with other straightforward approaches is that if the String doesn't contain “_” then an empty String will be returned. Here is a small StringUtils class (part of a larger one) that does that with beforeFirst static method in a multibyte safe way.
var_dump(StringUtils::beforeFirst("customname_489494984", "_"));
class StringUtils
{
/**
* Returns the part of a string <b>before the first</b> occurrence of the string to search for.
* #param <b>$string</b> The string to be searched
* #param <b>$search</b> The string to search for
* #param <b>$caseSensitive boolean :optional</b> Defines if the search will be case sensitive. By default true.
* #return string
*/
public static function beforeFirst($string,$search,$caseSensitive = true)
{
$firstIndex = self::firstIndexOf($string, $search,$caseSensitive);
return $firstIndex == 0 ? $string : self::substring($string, 0 , $firstIndex);
}
/**
* Returns a part of the string from a character and for as many characters as provided
* #param <b>$string</b> The string to retrieve the part from
* #param <b>$start</b> The index of the first character (0 for the first one)
* #param <b>$length</b> The length of the part the will be extracted from the string
* #return string
*/
public static function substring($string,$start,$length = null)
{
return ( $length == null ) ? ( mb_substr($string, $start) ) : ( $length == 0 ? "" : mb_substr($string, $start , $length) );
}
/**
* Return the index of <b>the first occurance</b> of a part of a string to the string
* #param <b>$string</b> The string to be searched
* #param <b>$search</b> The string to search for
* #param <b>$caseSensitive boolean :optional</b> Defines if the search will be case sensitive. By default true.
* #return number
*/
public static function firstIndexOf($string,$search,$caseSensitive = true)
{
return $caseSensitive ? mb_strpos($string, $search) : mb_stripos($string, $search);
}
/**
* Returns how many characters the string is
* #param <b>$string</b> The string
* #return number
*/
public static function length($string)
{
return mb_strlen($string);
}
}