Returns the numeric position of the first occurrence of
needle
in the
haystack
string. Unlike the
strrpos() before PHP 5, this function can take a full
string as the needle
parameter and the
entire string will be used.
If needle
is not found,
strpos() will return boolean FALSE.
注意: 本函数可安全用于二进制对象。
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
beginning of haystack
.
See also strrpos(), stripos(), strripos(), strrchr(), substr(), stristr(), and strstr().