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substr();

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substr();

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$str="abcdefg";

$des=substr($str,0,3);//´Ó$strµÄµÚÒ»¸ö×Ö·û¿ªÊ¼,ÏòÓÒÈ¥3¸ö×Ö·û,Ò²¾ÍÊÇ"abc"

$des=substr($str,-3,3);//´Ó$strµÄµ¹ÊýµÚÈý¸ö×Ö·û¿ªÊ¼,ÏòÓÒÈ¥3¸ö×Ö·û,Ò²¾ÍÊÇ"efg"

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substr
(PHP 3, PHP 4, PHP 5)

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


substr() returns the portion of string specified by the start and length parameters.

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.

Àý×Ó 1. 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