On Fri, Dec 21, 2012 at 7:06 PM, Jim Giner <jim.giner@xxxxxxxxxxxxxxxxxx> wrote:
> That actually makes sense tho. Afterall, a string is truly only one memory
> allocation whereas array elements are basically multiple vars having the
> same name. So - how can you unset one char in a string?
That actually depends on what you mean by "unset". If you mean to
remove it, str_replace should do, or if you only know it's position,
using substr twice to grab the front and back should work.
Setting a charcter to null ('') in the middle of the string could be
interesting for some applications...
Following up with the example I just showed:
// now let's 'unset' a character in the middle
$s3 = $s;
$s3[10] = '';
showstring($s3);
yields:
String of length 34 is Now we aregone down to the river!
s[0] : 'N' 78 s[1] : 'o' 111 s[2] : 'w' 119 s[3] : ' ' 32 s[4] : 'w'
119 s[5] : 'e' 101 s[6] : ' ' 32 s[7] : 'a' 97 s[8] : 'r' 114 s[9] :
'e' 101 s[10] : '' 0 s[11] : 'g' 103 s[12] : 'o' 111 s[13] : 'n' 110
s[14] : 'e' 101 s[15] : ' ' 32 s[16] : 'd' 100 s[17] : 'o' 111 s[18] :
'w' 119 s[19] : 'n' 110 s[20] : ' ' 32 s[21] : 't' 116 s[22] : 'o' 111
s[23] : ' ' 32 s[24] : 't' 116 s[25] : 'h' 104 s[26] : 'e' 101 s[27] :
' ' 32 s[28] : 'r' 114 s[29] : 'i' 105 s[30] : 'v' 118 s[31] : 'e' 101
s[32] : 'r' 114 s[33] : '!' 33
Still 34 byte string length, but looking at s[10] you see the null
byte. It didn't really affect printing, but it might affect other
things.
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
