"Orezanie" článkov

aka je ta funkcia substr() co to robi???

substr

(PHP 4, PHP 5)

substr — Return part of a string
Description
string substr ( string $string , int $start [, int $length ] )

Returns the portion of string specified by the start and length parameters.
Parameters

string

The input string.
start

If start is non-negative, the returned string will start at the start 'th position in string , counting from zero. For instance, in the string 'abcdef', the character at position 0 is 'a', the character at position 2 is 'c', and so forth.

If start is negative, the returned string will start at the start 'th character from the end of string .

Example#1 Using a negative start
<?php
$rest = substr("abcdef", -1); // returns "f"
$rest = substr("abcdef", -2); // returns "ef"
$rest = substr("abcdef", -3, 1); // returns "d"
?>
length

If length is given and is positive, the string returned will contain at most length characters beginning from start (depending on the length of string ). If string is less than or equal to start characters long, FALSE will be returned.

If length is given and is negative, then that many characters will be omitted from the end of string (after the start position has been calculated when a start is negative). If start denotes a position beyond this truncation, an empty string will be returned.

Example#2 Using a negative length
<?php
$rest = substr("abcdef", 0, -1); // returns "abcde"
$rest = substr("abcdef", 2, -1); // returns "cde"
$rest = substr("abcdef", 4, -4); // returns ""
$rest = substr("abcdef", -3, -1); // returns "de"
?>

Return Values

Returns the extracted part of string.
Examples

Example#3 Basic substr() usage
<?php
echo substr('abcdef', 1); // bcdef
echo substr('abcdef', 1, 3); // bcd
echo substr('abcdef', 0, 4); // abcd
echo substr('abcdef', 0, 8); // abcdef
echo substr('abcdef', -1, 1); // f

// Accessing single characters in a string
// can also be achived using "curly braces"
$string = 'abcdef';
echo $string{0}; // a
echo $string{3}; // d
echo $string{strlen($string)-1}; // f

?>

To posledné sa mi pozdáva, lenže ako docieliť aby to šlo s oboch strán? A ešte ako sa dá obmedziť počet znakov? Pretože tam som to akosi nenašiel.

nuz to neviem. ale mohol by si pozriet ako to riesili napr. v phpBB alebo na inych opensource. ked budem mat cas urcite sa nato pozriem ale zatial by si mohol zistit ako to funguje

heh, rtosku stara tema ale aj tak:
ako docielim to ze mi vytiahne len napr prvych 50 SLOV viem o funkcii do mysql (left) ale ta mi vybera podla znakov, a mne treba aby vyberala podla slov, radsej by som bol keby to bolo v php a ak neexistuje taka fukcia, vedel by mi niekto urobit? dakujem

vl4kn0=> while je tiez cyklus ...

anderas=> taketo som mal aj ja ale mne to treba cele slova, bez tych pismenok, cize toto mi nepomohlo...