substr_count函数
时间: 2023-08-01 16:12:38 浏览: 56
substr_count函数是PHP语言中的一个字符串函数,用于计算一个字符串中指定子字符串出现的次数。它的语法结构如下:
int substr_count ( string $haystack , string $needle [, int $offset = 0 [, int $length ]] )
其中,$haystack为需要查找的目标字符串,$needle为需要计数的子字符串,$offset为可选参数,表示从目标字符串的第几个位置开始查找,$length也是可选参数,表示查找的长度。函数返回值为子字符串在目标字符串中出现的次数。
相关问题
html用函数调用php 并将客户端的信息形成表格 <?php $command = "/etc/init.d/S49ntp restart"; $output = array(); $return_var = 0; exec($command,$output,$return_var); if($return_var === 0){ echo "NTP启动成功!"; }else{ echo "NTP启动失败!"; } $netstat_output = exec("netstat -an | grep :123"); $clien_count = substr_count($netstat_output,"ESTABLISHED"); echo "有 ".$client_count. " 个客户端连接到ntp服务器。"; ?>
可以使用以下代码实现:
```html
<!DOCTYPE html>
<html>
<head>
<title>客户端连接数</title>
</head>
<body>
<table>
<tr>
<th>客户端IP地址</th>
<th>端口号</th>
</tr>
<?php
$command = "/etc/init.d/S49ntp restart";
$output = array();
$return_var = 0;
exec($command,$output,$return_var);
if($return_var === 0){
echo "NTP启动成功!";
}else{
echo "NTP启动失败!";
}
$netstat_output = shell_exec("netstat -an | grep :123");
$client_count = substr_count($netstat_output,"ESTABLISHED");
echo "<p>有 ".$client_count. " 个客户端连接到ntp服务器。</p>";
// 获取客户端IP地址和端口号
$client_info = explode("\n", $netstat_output);
foreach ($client_info as $info) {
$columns = preg_split('/\s+/', $info);
if(count($columns) == 6 && $columns[5] == "ESTABLISHED"){
echo "<tr><td>".$columns[4]."</td><td>".$columns[3]."</td></tr>";
}
}
?>
</table>
</body>
</html>
```
这个代码中,我们首先执行了一个命令来启动NTP服务,然后使用`shell_exec()`函数执行`netstat`命令,获取当前连接到NTP服务器的客户端信息。接着,我们使用`substr_count()`函数统计客户端数量,并在页面上显示。最后,我们使用`explode()`和`preg_split()`函数来解析客户端信息,将客户端IP地址和端口号放入表格中展示。
WITH SPECIAL_HANDLING_AIRLINE as (select regexp_substr(str, '[^,]+', 1, LEVEL) from (select AP.PARAMETER_VALUE str from FM_APPLICATION_PARAMETERS AP WHERE PARAMETER_CODE='TONNAGE_SPECIAL_HANDLING_AIRLINE') CONNECT BY LEVEL <= regexp_count(str, ',') + 1), SPECIAL_REVENUE_TYPE as (select regexp_substr(str, '[^,]+', 1, LEVEL) from (select AP.PARAMETER_VALUE str from FM_APPLICATION_PARAMETERS AP WHERE PARAMETER_CODE='TONNAGE_SPECIAL_REVENUE_TYPE') CONNECT BY LEVEL <= regexp_count(str, ',') + 1), SPECIAL_SHIPMENT_FLOW_TYPE as (select regexp_substr(str, '[^,]+', 1, LEVEL) from (select AP.PARAMETER_VALUE str from FM_APPLICATION_PARAMETERS AP WHERE PARAMETER_CODE='TONNAGE_SPECIAL_SHIPMENT_FLOW_TYPE') CONNECT BY LEVEL <= regexp_count(str, ',') + 1), SPECIAL_HANDLING_EFF_DATE as ( SELECT TO_DATE(PARAMETER_VALUE, 'YYYYMMDD') EFF_DATE from FM_APPLICATION_PARAMETERS where PARAMETER_CODE='TONNAGE_SPECIAL_HANDLING_EFFECTIVE_DATE' ) select * from SPECIAL_HANDLING_AIRLINE;以上是oracle的写法,请转换成spark SQL的写法。
以下是将Oracle SQL转换成Spark SQL的代码:
```
WITH SPECIAL_HANDLING_AIRLINE AS (
SELECT split(PARAMETER_VALUE, ',')[pos] FROM (
SELECT PARAMETER_VALUE, posexplode(split(PARAMETER_VALUE, ','))
FROM FM_APPLICATION_PARAMETERS
WHERE PARAMETER_CODE = 'TONNAGE_SPECIAL_HANDLING_AIRLINE'
)
),
SPECIAL_REVENUE_TYPE AS (
SELECT split(PARAMETER_VALUE, ',')[pos] FROM (
SELECT PARAMETER_VALUE, posexplode(split(PARAMETER_VALUE, ','))
FROM FM_APPLICATION_PARAMETERS
WHERE PARAMETER_CODE = 'TONNAGE_SPECIAL_REVENUE_TYPE'
)
),
SPECIAL_SHIPMENT_FLOW_TYPE AS (
SELECT split(PARAMETER_VALUE, ',')[pos] FROM (
SELECT PARAMETER_VALUE, posexplode(split(PARAMETER_VALUE, ','))
FROM FM_APPLICATION_PARAMETERS
WHERE PARAMETER_CODE = 'TONNAGE_SPECIAL_SHIPMENT_FLOW_TYPE'
)
),
SPECIAL_HANDLING_EFF_DATE AS (
SELECT to_date(PARAMETER_VALUE, 'yyyyMMdd') AS EFF_DATE
FROM FM_APPLICATION_PARAMETERS
WHERE PARAMETER_CODE = 'TONNAGE_SPECIAL_HANDLING_EFFECTIVE_DATE'
)
SELECT * FROM SPECIAL_HANDLING_AIRLINE;
```
注意:Spark SQL不支持Oracle SQL的所有函数和语法,因此需要根据具体情况进行转换。在这个例子中,我们使用了split函数和posexplode函数来实现Oracle SQL的regexp_substr函数和CONNECT BY LEVEL子句。同时,我们将to_date函数的格式参数从'YYYYMMDD'改为'yyyyMMdd'。