(PECL event >= 1.2.6-beta)
EventBuffer::search — Scans the buffer for an occurrence of a string
Scans the buffer for an occurrence of the string
what
. It returns numeric position of the string, or false
if the string was
not found.
If the
start
argument is provided, it points to the position at which the search should
begin; otherwise, the search is performed from the start of the string. If
end
argument provided, the search is performed between start and end buffer
positions.
what
String to search.
start
Start search position.
end
End search position.
Returns numeric position of the first occurrence of the string in the
buffer, or false
if string is not found.
此函數(shù)可能返回布爾值
false
,但也可能返回等同于 false
的非布爾值。請(qǐng)閱讀 布爾類型章節(jié)以獲取更多信息。應(yīng)使用
===
運(yùn)算符來(lái)測(cè)試此函數(shù)的返回值。
示例 #1 EventBuffer::search() example
<?php
// Count total occurrences of 'str' in 'buf'
function count_instances($buf, $str) {
$total = 0;
$p = 0;
$i = 0;
while (1) {
$p = $buf->search($str, $p);
if ($p === FALSE) {
break;
}
++$total;
++$p;
}
return $total;
}
$buf = new EventBuffer();
$buf->add("Some string within a string inside another string");
var_dump(count_instances($buf, "str"));
?>
以上例程的輸出類似于:
int(3)