# EventBuffer::search

(PECL event >= 1.2.6-beta)

EventBuffer::search — Scans the buffer for an occurrence of a string

### 说明

public EventBuffer::search( string `$what` , int `$start` = -1 , int `$end` = -1 ): mixed

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.

### 参数

`what`

  String to search.

`start`

  Start search position.

`end`

  End search position.

### 返回值

Returns numeric position of the first occurrence of the string in the buffer, or `false` if string is not found.

警告

此函数可能返回布尔值 `false`，但也可能返回等同于 `false` 的非布尔值。请阅读 布尔类型章节以获取更多信息。应使用 === 运算符来测试此函数的返回值。

### 示例

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"));
?>`

以上示例的输出类似于：

    int(3)

### 参见

- EventBuffer::searchEol() - Scans the buffer for an occurrence of an end of line

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