08-31-2006
How to add character in specific position of a string?
Hi All,
I would like to use sed to add "-" between the following string:
Value: 20060830
Result: 2006-08-30
Pls advice. Thx a lot
Victor
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STRRPOS(3) 1 STRRPOS(3)
strrpos - Find the position of the last occurrence of a substring in a string
SYNOPSIS
int strrpos (string $haystack, string $needle, [int $offset])
DESCRIPTION
Find the numeric position of the last occurrence of $needle in the $haystack string.
PARAMETERS
o $haystack
- The string to search in.
o $needle
- If $needle is not a string, it is converted to an integer and applied as the ordinal value of a character.
o $offset
- If specified, search will start this number of characters counted from the beginning of the string. If the value is negative,
search will instead start from that many characters from the end of the string, searching backwards.
RETURN VALUES
Returns the position where the needle exists relative to the beginnning of the $haystack string (independent of search direction or off-
set). Also note that string positions start at 0, and not 1.
Returns FALSE if the needle was not found.
Warning
This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
Booleans for more information. Use the === operator for testing the return value of this function.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.0.0 | |
| | |
| | The $needle may now be a string of more than one |
| | character. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
Checking if a needle is in the haystack
It is easy to mistake the return values for "character found at position 0" and "character not found". Here's how to detect the
difference:
<?php
$pos = strrpos($mystring, "b");
if ($pos === false) { // note: three equal signs
// not found...
}
?>
Example #2
Searching with offsets
<?php
$foo = "0123456789a123456789b123456789c";
var_dump(strrpos($foo, '7', -5)); // Starts looking backwards five positions
// from the end. Result: int(17)
var_dump(strrpos($foo, '7', 20)); // Starts searching 20 positions into the
// string. Result: int(27)
var_dump(strrpos($foo, '7', 28)); // Result: bool(false)
?>
SEE ALSO
strpos(3), stripos(3), strripos(3), strrchr(3), substr(3).
PHP Documentation Group STRRPOS(3)