子字符串php
代码示例
substr()php
<?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 achieved using "square brackets"
$string = 'abcdef';
echo $string[0]; // a
echo $string[3]; // d
echo $string[strlen($string)-1]; // f
?>
//substr() function returns certain bits of a string php获取字符串的一部分
substr ( $string , $start , $length );
/**Returns the extracted part of string;
*or FALSE on failure, or an empty string
*/php substr
<?php
$rest = substr("abcdef", 0, -1); // "abcde"
$rest = substr("abcdef", 2, -1); // "cde"
$rest = substr("abcdef", 4, -4); // false
$rest = substr("abcdef", -3, -1); // "de"php修剪字符串到长度
<?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 achieved using "square brackets"
$string = 'abcdef';类似页面
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