<?php
function cut_s($v, $a, $b) {
if (! $i) {
$i = 0;
} else {
}
if (! $j) {
}
return $i < $j ?
substr($v, $i, $j - $i) : ''; }
/* テスト */
$v = "あいうえおかきくけこさしすせそ";
$a = "え";
$b = "すせ";
echo "|" . cut_s($v, $a, $b) . "|\n";
$a = "ま";
$b = "すせ";
echo "|" . cut_s($v, $a, $b) . "|\n";
$a = "え";
$b = "ぴ";
echo "|" . cut_s($v, $a, $b) . "|\n";
$a = "こさ";
$b = "うえ";
echo "|" . cut_s($v, $a, $b) . "|\n";
$a = "んぺ";
$b = "んぺ";
echo "|" . cut_s($v, $a, $b) . "|\n";
$v = "あいうえおかきくえけこさしえすせそ";
$a = "え";
$b = "すせ";
echo "|" . cut_s($v, $a, $b) . "|\n";
$a = "い";
$b = "え";
echo "|" . cut_s($v, $a, $b) . "|\n";
?>
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