Here is a real world example:įrom draft.js we get paragraphs with multiple links designated only with offset, anchor text length, url, target. If you are looping through a string which has multiple substrings that need to be replaced, you have to add an offset factor to each original offset before you replaced any strings. This may be obvious to others, but I just spent hours and my feeble brain only caught up to it after a long break. long string.') you can use this (requires the truncate function): The above function truncates around the end, but if you want to truncate around the middle (ie 'Hello this is a long string.' -> 'Hello this.

I also needed a sort of 'middle' truncate. $text = htmlentities ( $text, ENT_QUOTES ) Substr ( $text, 0, - strspn ( strrev ( $text ), $punctuation )) $text = ( strspn ( strrev ( $text ), $punctuation )!= 0 ) $punctuation = '.!?: ,-' //punctuation you want removed $text = substr ( $text, 0, strrpos ( $text, ' ' )) So even if it has an ellipse with 3 dots, 2 dots, 4 dots, it'll be removed, then re-added. It removes all trailing punctuation (that you include in the $punctuation string below) and then adds an ellipse. The older function would end up looking like 'blah blah?.' or 'blah blah.' which doesn't look so nice to me. Particularly if you have content that may have any kind of punctuation in it (?, !, ?!?,. I like the truncate function below.however, I found a few issues. Return ( is_null ( $length ) = true ) ? substr_replace ( $string, $replacement, $start ) : substr_replace ( $string, $replacement, $start, $length ) mb_substr ( $string, $start + $length, $string_length - $start - $length, $encoding )

Return mb_substr ( $string, 0, $start, $encoding ). mb_substr ( $string, $start + $length, $string_length - $start - $length ) Return mb_substr ( $string, 0, $start ). If (( $start + $length ) > $string_length ) Here is a version that mimics the behavior of substr_replace() exactly: (Of course, as mentioned in the manual, when length is negative it actually represents the position before it)įorget all of the mb_substr_replace() implementations mentioned in this page, they're all buggy. It's worth noting that when start and length are both negative -and- the length is less than or equal to start, the length will have the effect of being set as 0.Īnother note, if length is negative and start offsets the same position as length, length (yet again) will have the effect as being set as 0. Length is zero then this function will have the Is not given, then it will default to strlen( Negative, it represents the number of characters from the end of If given and is positive, it represents the length of the portion of If offset is negative, the replacing willīegin at the offset'th character from the

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Php substring from string