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Hi, I have a problem when try access to $_POST vars in php. I have a combo with this name "c012". Well, I send the form with this var, and I have checked this var is send ok, and when I try access with this code, where $var1, $var2 and $var3 are numbers:
$var1 = 0;
$var2 = 1;
$var3 = 2;
$pointer_combo = "c".$var1.$var2.$var3;
echo $_POST['$pointer_combo'];
Don't show anything, but if I try this:
echo $_POST['c012'];
Works, and show the value. Whats the problem with code above?
If you are using a dynamic index (index value stored in a variable), you don't need the quotes.
Try this:
echo $_POST[$pointer_combo];
PHP won't do variable substitution if the value is in single quotes. Only double quotes or no quotes. So
echo $_POST[$pointer_combo];
Would work, as would:
echo $_POST["$pointer_combo"];
(But obviously in that second example there isn't much point in the quotes being there!)
Lose the quotes:
$_POST[$pointer_combo];
Related
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I am trying to insert these $lat and $lng variable into the final $html variable with no success. Can somebody point me in the right direction?..
Much Appreciated.
<?php
$lat = '33.599968';
$lng = '-112.119499';
$url = 'http://maps.google.com/maps/api/staticmap? center=$lat,$lng&zoom=13&size=665x400&markers=color:red|$lat,$lng&sensor=false';
$html = '<img border="0" src="$url" width="665" height="400" border="1"></a>';
echo $lat;
echo $lng;
echo $url;
echo $html;
?>
two changes in the url line:
$url = "http://maps.google.com/maps/api/staticmap?center=$lat,$lng&zoom=13&size=665x400&markers=color:red|$lat,$lng&sensor=false";
" instead of ' so that php will evaluate $lat,$lng
And you want remove the space before center:
... staticmap? center ...
becomes
... staticmap?center ...
Strings delimited with double quotes " interpolate variables, strings delimited with single quotes ' do not. Use ".
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How do I make the following url to be read:
localhost/index.php?errormsg=wrongpassword
so I want it to set the variable $errormsg to 'wrongpassword' how do I do that? I am pretty sure there is a way using $_GET or $_POST?
You want to use $_GET['errormsg'].
Something like this should do:
if isset($_GET['errormsg'])
{
echo $_GET['errormsg'];
}
$errormsg = $_GET['errormsg']
This should do the trick for you
$_GET['errormsg'] is the answer of your question.
print_r($_GET)
to see all variables in the URL. in this case you want
$_GET['errormsg']
You were as close as ever. A single google would've yielded the answer to you :)
http://php.net/manual/en/reserved.variables.get.php
<?php
// use htmlspecialchars() to clean up url-encoded characters
$error_message = htmlspecialchars($_GET["errormsg"]);
echo 'Error: ' . $error_message;
?>
prints: "Error: error_here", if url = ...?errormsg=error_here
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I want to remove a particular match of characters from a string.
For example i have strings;
topics-p10-new-model-cars
topics-p20-new-model-cars
topics-p30-new-model-cars
topics-p40-new-model-cars
Then i need the results as,
topics-new-model-cars
topics-new-model-cars
topics-new-model-cars
topics-new-model-cars
That means i want to remove p10-,p20-,etc..
.Those are the page numbers. It may be any number..
How can i do this..? Thanks in advance
Try this:
$result = preg_replace('/\-p\d+/', '', $string);
Note: I'm assuming that the string format does not change (I mean this [topics-p10-new-model-cars]). If my assumption is right.
Then you can do this
if (textBox1.Text.Contains("-p10-"))
{
//topics-p10-new-model-cars
String[] splited = textBox1.Text.Split(new char[] {'-'});
String rString = String.Format("{0}-{1}-{2}-{3}",
splited[0],splited[2],splited[3],splited[4]);
MessageBox.Show(rString);
}
//OR This method
if (textBox1.Text.Contains("-p10-"))
{
String result = textBox1.Text.Replace("p10-", "");
MessageBox.Show(result);
}
With 'preg-replace'::
For, example:
<?
echo preg_replace('/p[0-9]+\-/', '', 'topics-p10-new-model-cars');
?>
Follow this link:
http://www.php.net/manual/en/function.preg-replace.php
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When I type:
<?php
$temp="1234";
echo "<script type='text/javascript'>document.write({$temp});</script>";
?>
I get 1234 on the screen.
But when I replace $temp="1234" with $temp="alfa" I get nothing on the screen.
What's the problem ? Where am I wrong ? "1234" and "alfa" are both strings
alert(1234) is valid javascript, and will simply pop up the integer 1234 on your screen.
alert(alfa) is attempting to pop up the contents of a variable named alfa on your screen, which doesn't exist.
If you're insert data from PHP into a Javascript context, you MUST use json_encode() to ensure that you're producing VALID javascript. e.g.
$temp = 'alfa';
$json= json_encode($temp);
echo '<script>.... {$json}...</script>';
that will produce alert('alfa') and work as expected.
You aren't enclosing the text in the double-quote character '"' which denotes a string.
document.write(1234) works because 1234 is a valid value in JavaScript (an integer), whereas alfa is a symbol name, it should be "alfa".
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How would one use the mysql/php $list['key'] inside a php echo i.e
echo "<p> My Text . $list[''] . </p>";
Thanks In Advance
It is as simple as that:
echo "<p> My Text $list[index] </p>";
N. b.: you do not use single quotes (') for the index as you usually would, like in $a=$list['index'];, since the whole thing is already enclosed in double quotes (").
Correction:
Just found out, with indices like 'a b' you still do need the quotes! (Thanks, Jon!)
Edit: (response to comment)
That is a competely different thing! Use
list($var1,$var2) = mysql_fetch_assoc($result);
instead. The list()-construct (is it a function?!?) extracts the values out of the assigned array (in your case the result of your mysql_fetch_assoc()-function). Assuming, that your result set returns values for two columns (otherwise you will have to supply more variables in list()). And then place the variables into your text like
echo "<p> My Text $var1 and somewhere maybe also $var2 ... </p>";
Still, since you are using mysql_fetch_assoc($result) you could do
$z=mysql_fetch_assoc($result);
echo "<p> My Text $z[field1] and somewhere maybe also $z[field2] ... </p>";
with field1 and field2 being the actual column names from your MySQL table.
It is customary on this site now, to also warn you of the dangers of still using the deprecated mysql_*functions. You should change to the more secure and modern versions of mysqli_*...
In this context, usually you would just write the bare array key between the angle brackets:
echo "$array[key]";
However, if key is the empty string or if it contains any of a class of characters that have special meaning in this context then you can't do this. For example, these will not work:
echo "$array[]"; // empty string key
echo "$array[]]"; // string key: "]"
In this case you can add {} around the variable and use single quotes as if you were not inside a double quoted string context. For example:
echo "{$array['']}";
echo "{$array[']']}";
This is called complex string variable parsing; see the manual for more information.