Strings

Checks if the string is valid in UTF-8 encoding.

Removes all invalid UTF-8 characters from a string.

Returns a specific character in UTF-8 from code point (number in range 0x0000..D7FF or 0xE000..10FFFF).

Starts the $haystack string with the prefix $needle?

Ends the $haystack string with the suffix $needle?

Does $haystack contain $needle?

Returns a part of UTF-8 string specified by starting position and length. If start is negative, the returned string will start at the start'th character from the end of string.

Removes control characters, normalizes line breaks to \n, removes leading and trailing blank lines, trims end spaces on lines, normalizes UTF-8 to the normal form of NFC.

Standardize line endings to unix-like.

Converts UTF-8 string to ASCII, ie removes diacritics etc.

Modifies the UTF-8 string to the form used in the URL, ie removes diacritics and replaces all characters except letters of the English alphabet and numbers with a hyphens.

Truncates a UTF-8 string to given maximal length, while trying not to split whole words. Only if the string is truncated, an ellipsis (or something else set with third argument) is appended to the string.

Indents a multiline text from the left. Second argument sets how many indentation chars should be used, while the indent itself is the third argument (tab by default).

Converts all characters of UTF-8 string to lower case.

Converts the first character of a UTF-8 string to lower case and leaves the other characters unchanged.

Converts all characters of a UTF-8 string to upper case.

Converts the first character of a UTF-8 string to upper case and leaves the other characters unchanged.

Converts the first character of every word of a UTF-8 string to upper case and the others to lower case.

Compares two UTF-8 strings or their parts, without taking character case into account. If length is null, whole strings are compared, if it is negative, the corresponding number of characters from the end of the strings is compared, otherwise the appropriate number of characters from the beginning is compared.

Finds the common prefix of strings or returns empty string if the prefix was not found.

Returns number of characters (not bytes) in UTF-8 string.

That is the number of Unicode code points which may differ from the number of graphemes.

Removes all left and right side spaces (or the characters passed as second argument) from a UTF-8 encoded string.

Pads a UTF-8 string to given length by prepending the $pad string to the beginning.

Pads UTF-8 string to given length by appending the $pad string to the end.

Reverses UTF-8 string.

Returns part of $haystack before $nth occurence of $needle or returns null if the needle was not found.

Negative value means searching from the end.

Returns part of $haystack after $nth occurence of $needle or returns null if the needle was not found.

Negative value means searching from the end.

Returns position in characters of $nth occurence of $needle in $haystack or null if the $needle was not found.

Negative value of $nth means searching from the end.

Splits a string into array by the regular expression. Parenthesized expression in the delimiter are captured.

Parameter $flags can be any combination of PREG_SPLIT_NO_EMPTY and PREG_OFFSET_CAPTURE flags.

Checks if given string matches a regular expression pattern and returns an array with first found match and each subpattern.

Parameter $flags can be any combination of PREG_OFFSET_CAPTURE and PREG_UNMATCHED_AS_NULL flags.

Finds all occurrences matching regular expression pattern and returns a two-dimensional array. Result is array of matches (ie uses by default PREG_SET_ORDER).

Parameter $flags can be any combination of PREG_OFFSET_CAPTURE, PREG_UNMATCHED_AS_NULL and PREG_PATTERN_ORDER flags.

Replaces all occurrences matching regular expression $pattern which can be string or array in the form pattern => replacement.

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