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iasky 2006-08-30
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ereg()
omoon 2006-08-30
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PHP里用于查找或者匹配或者定位的函数里用得比较多的是strstr,stristr.
后者与前者的功能，返回值都一样，只是不区分大小写。
strstr("母字符串", "子字符串")用来查找子字符串在母字符串中第一次出现的位置,
并返回母字符串中从子字符串开始到母字符串结束的部分。
如果找不到子字符串，则返回空。
后者与前者的功能，返回值都一样，只是不区分大小写。
strstr("母字符串", "子字符串")用来查找子字符串在母字符串中第一次出现的位置,
并返回母字符串中从子字符串开始到母字符串结束的部分。
如果找不到子字符串，则返回空。
caotian2000 2006-08-30
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<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// Note our use of ===. Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
echo "The string '$findme' was not found in the string '$mystring'";
} else {
echo "The string '$findme' was found in the string '$mystring'";
echo " and exists at position $pos";
}
// We can search for the character, ignoring anything before the offset
$newstring = 'abcdef abcdef';
$pos = strpos($newstring, 'a', 1); // $pos = 7, not 0
?>
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// Note our use of ===. Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
echo "The string '$findme' was not found in the string '$mystring'";
} else {
echo "The string '$findme' was found in the string '$mystring'";
echo " and exists at position $pos";
}
// We can search for the character, ignoring anything before the offset
$newstring = 'abcdef abcdef';
$pos = strpos($newstring, 'a', 1); // $pos = 7, not 0
?>
