数据库字符串在postgresql比较不识别字符串长度

Question

我在服务器之间传输数据，并需要更改我们的wiki数据库中的一些链接。我写了一个快速的脚本，应该能够做到这一点没有问题。但是当我运行它时，if($datacount)条件从不运行。这可能很简单，我错过了，但我看不出是什么问题。

$dbconn = pg_connect("host= localhost port=5432 dbname=wiki user=user password=password"); 
$sql = "SELECT old_text FROM wiki_public.pagecontent LIMIT 10"; 
$go = pg_query($dbconn,$sql); 
$i=0; 
$string = 'sometext'; 
while($data = pg_fetch_assoc($go)) { 
    $info = $data['old_text']; 
    $count = strlen($string); 
    $datacount = strlen($info); 
    echo "Length: ".$datacount."<br/>"; 
    if($datacount != 0) { 
    $position = strpos($string,$info); 
    if($position !== false) { 
     echo "The string ".$string." was found in row ".$i." and exists at position ".$position."The original content was: ".substr($info, $position,$count)."<br/>"; 
    } 
    } 
    $i++; 
} 

谢谢！ 编辑

当我删除了$datacount条件，这是我的输出

Length: 0 

Warning: strpos(): Empty delimiter in D:\www\import\linksupadte.php on line 12 
Length: 12 
Length: 0 

Warning: strpos(): Empty delimiter in D:\www\import\linksupadte.php on line 12 
Length: 31 
Length: 31 
Length: 0 

Warning: strpos(): Empty delimiter in D:\www\import\linksupadte.php on line 12 
Length: 444 
Length: 1614 
Length: 153 
Length: 125 

Answer 1

我今天宣布一个无脑的一天对我来说。

<?php 
# Database connection snipped. 

# Let's say the database contains at least one row that's a substring 
# of $string. Something like 'John', or '/123/'. 
$string = 'John/123/456/789/012'; 
while($data = pg_fetch_assoc($go)) { 

    $position = strpos($string, $data['old_text']); 

    if ($position !== false) { 
    echo "$string contains ".$data['old_text']; 
    } 
    else { 
    echo "$string does not contain ".$data['old_text']; 
    } 
} 

?>