php使用strpos注意
- mystring = 'abc';
- $findme = 'a';
- if (strpos($mystring, $findme)){
- echo '找到';
- }else{
- echo '找不到';
- }
由于’a'是在第一个字符所以返回是’0′,’0′等于’false’所以显示’找不到’;
应使用以下方式
- 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";
- }