Returns the numeric position of the first occurrence of
needle in the haystack string. Unlike the
strrpos(), this function can take a full string as
the needle parameter and
the entire string will be used.
If needle is not
found, returns FALSE.
注: It is easy to mistake the return values for "character found at position 0" and "character not found". Here's how to detect the difference:
// in PHP 4.0b3 and newer: $pos = strpos($mystring, "b"); if ($pos === false) { // note: three equal signs // not found... } // in versions older than 4.0b3: $pos = strpos($mystring, "b"); if (!is_integer($pos)) { // not found... }
If needle is not a
string, it is converted to an integer and applied as the
ordinal value of a character.
The optional offset
parameter allows you to specify which character in haystack to start searching. The
position returned is still relative to the the beginning of
haystack.
See also strrpos(),
strrchr(), substr(),
stristr(), and
strstr().