php代码
<?php
/**
* @description: 获取模式串在主字符串中的所有首字母出现索引位置(递归版)
* @author: cutefrog(injection.mail@gmail.com)
* @parameter: $mainstr 主字符串(必要参数)
* @parameter: $modestr 模式串(必要参数)
* @parameter: $mainpos 主字符串起始索引(可选参数)
* @parameter: $modepos 模式串起始索引(可选参数)
* @parameter: $matcheds 匹配到的索引数组(不需传入的参数，只作为递归时函数传递参数之用)
* @return: $matcheds 如果非空返回匹配到的索引数组，否则返回-1
*/
function myStrPos_recursive( $mainstr, $modestr, $mainpos = 0, $modepos = 0, $matcheds = array() ) {
//若数组为空则返回-1,否则返回匹配到的数组
if( !isset( $mainstr[$mainpos] ) ) {
return empty($matcheds)?-1:$matcheds;
}
//如果匹配到了就继续与模式串的下一个字符比较
if ( $modestr[$modepos] == $mainstr[$mainpos] ) {
if ( !isset($modestr[$modepos+1]) ){
//将匹配结果加入数组
array_push( $matcheds, $mainpos - $modepos );
return myStrPos_recursive ( $mainstr, $modestr, ++$mainpos, 0, $matcheds );
}
return myStrPos_recursive ( $mainstr, $modestr, ++$mainpos, ++$modepos, $matcheds );
}
//否则回溯主串字符数组索引
else {
return myStrPos_recursive ( $mainstr, $modestr, $mainpos-=$modepos-1, 0, $matcheds );
}
}
/**
* @description: 获取模式串在主字符串中的所有首字母出现索引位置(迭代版)
* @author: cutefrog(injection.mail@gmail.com)
* @parameter: $mainstr 主字符串(必要参数)
* @parameter: $modestr 模式串(必要参数)
* @return: $matcheds 如果非空返回匹配到的索引数组，否则返回-1
*/
function myStrPos_iteration( $mainstr, $modestr ) {
$mainlen = strlen( $mainstr );
$modelen = strlen( $modestr );
$matchedpos = -1;
$limit = 0;
$matcheds = array();
for ( $mainpos = 0; $mainpos < $mainlen; $mainpos++ ){
for ( $modepos = 0; $modepos < $modelen; $modepos++ )
if ( $modestr[$modepos] == $mainstr[$mainpos] ){
if ( $modepos == ( $modelen - 1 ) ){
$matcheds[$limit++] = $mainpos - $modepos;
break;
}
$mainpos++;
}
else {
$mainpos = $mainpos - $modepos;
break;
}
}
return empty($matcheds)?-1:$matcheds;
}
$mainstr = 'dccabsccadsacca';
$modestr = 'cca';
print_r( myStrPos_recursive( $mainstr, $modestr ) );
print_r( myStrPos_iteration( $mainstr, $modestr ) );
?> 
