請求不適用於我

Question

我不明白爲什麼此請求無效。

$query ="UPDATE $this->tabdata SET "; 
foreach ($this->dataedit as $key => $value) { 
$query .= "".$key." = '".$value."', "; 
} 

$pat ="+-0*/"; 
$query .= $pat; 
$query = str_replace(", ".$pat," ", $query) ; 
$query .=" WHERE id = '$id' "; 
echo $query; 
$sql = mysql_query($query); 

Answer 1

$query ="UPDATE $this->tabdata SET "; 
foreach ($this->dataedit as $key => $value) { 
$query .= "".$key." = '".$value."', "; 
} 

$pat ="+-0*/"; 
$query .= $pat; 
$query = str_replace(", ".$pat," ", $query) ; 
$query .=" WHERE id = '{$id}' ";//modify'$id' to '{$id}',try again 
echo $query; 
$sql = mysql_query($query); 

鏈接Strings's single quoted part

注：當它們出現在單引號字符串特殊字符不像雙引號和定界符語法，變量和轉義序列不會被擴大。