I am new to php. I am trying extract a particular value from a joke file using file_get_content( text.txt, NULL,NULL, 200, 4) but it returns the values after the 200th character. please is there a better way to do this. like instead of specifying the position which may vary i specify a word rather
Perhaps this solution might be what you are looking for?
<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
if ($pos === false) {
echo "Not found";
} else {
echo "The string '$findme' was found in the string '$mystring'";
echo " and exists at position $pos";
}
?>
Related
I have an HTML form field $_POST["url"], having some URL strings as the value.
Example values are:
https://example.com/test/1234?email=xyz#test.com
https://example.com/test/1234?basic=2&email=xyz2#test.com
https://example.com/test/1234?email=xyz3#test.com
https://example.com/test/1234?email=xyz4#test.com&testin=123
https://example.com/test/the-page-here/1234?someurl=key&email=xyz5#test.com
etc.
How can I get only the email parameter from these URLs/values?
Please note that I am not getting these strings from the browser address bar.
You can use the parse_url() and parse_str() for that.
$parts = parse_url($url);
parse_str($parts['query'], $query);
echo $query['email'];
If you want to get the $url dynamically with PHP, take a look at this question:
Get the full URL in PHP
All the parameters after ? can be accessed using $_GET array. So,
echo $_GET['email'];
will extract the emails from urls.
Use the parse_url() and parse_str() methods. parse_url() will parse a URL string into an associative array of its parts. Since you only want a single part of the URL, you can use a shortcut to return a string value with just the part you want. Next, parse_str() will create variables for each of the parameters in the query string. I don't like polluting the current context, so providing a second parameter puts all the variables into an associative array.
$url = "https://mysite.com/test/1234?email=xyz4#test.com&testin=123";
$query_str = parse_url($url, PHP_URL_QUERY);
parse_str($query_str, $query_params);
print_r($query_params);
//Output: Array ( [email] => xyz4#test.com [testin] => 123 )
As mentioned in another answer, the best solution is using parse_url().
You need to use a combination of parse_url() and parse_str().
The parse_url() parses the URL and return its components that you can get the query string using the query key. Then you should use parse_str() that parses the query string and returns
values into a variable.
$url = "https://example.com/test/1234?basic=2&email=xyz2#test.com";
parse_str(parse_url($url)['query'], $params);
echo $params['email']; // xyz2#test.com
Also you can do this work using regex: preg_match()
You can use preg_match() to get a specific value of the query string from a URL.
preg_match("/&?email=([^&]+)/", $url, $matches);
echo $matches[1]; // xyz2#test.com
preg_replace()
Also you can use preg_replace() to do this work in one line!
$email = preg_replace("/^https?:\/\/.*\?.*email=([^&]+).*$/", "$1", $url);
// xyz2#test.com
Use $_GET['email'] for parameters in URL.
Use $_POST['email'] for posted data to script.
Or use _$REQUEST for both.
Also, as mentioned, you can use parse_url() function that returns all parts of URL. Use a part called 'query' - there you can find your email parameter. More info: http://php.net/manual/en/function.parse-url.php
You can use the below code to get the email address after ? in the URL:
<?php
if (isset($_GET['email'])) {
echo $_GET['email'];
}
I a created function from Ruel's answer.
You can use this:
function get_valueFromStringUrl($url , $parameter_name)
{
$parts = parse_url($url);
if(isset($parts['query']))
{
parse_str($parts['query'], $query);
if(isset($query[$parameter_name]))
{
return $query[$parameter_name];
}
else
{
return null;
}
}
else
{
return null;
}
}
Example:
$url = "https://example.com/test/the-page-here/1234?someurl=key&email=xyz5#test.com";
echo get_valueFromStringUrl($url , "email");
Thanks to #Ruel.
$web_url = 'http://www.writephponline.com?name=shubham&email=singh#gmail.com';
$query = parse_url($web_url, PHP_URL_QUERY);
parse_str($query, $queryArray);
echo "Name: " . $queryArray['name']; // Result: shubham
echo "EMail: " . $queryArray['email']; // Result:singh#gmail.com
A much more secure answer that I'm surprised is not mentioned here yet:
filter_input
So in the case of the question you can use this to get an email value from the URL get parameters:
$email = filter_input( INPUT_GET, 'email', FILTER_SANITIZE_EMAIL );
For other types of variables, you would want to choose a different/appropriate filter such as FILTER_SANITIZE_STRING.
I suppose this answer does more than exactly what the question asks for - getting the raw data from the URL parameter. But this is a one-line shortcut that is the same result as this:
$email = $_GET['email'];
$email = filter_var( $email, FILTER_SANITIZE_EMAIL );
Might as well get into the habit of grabbing variables this way.
$uri = $_SERVER["REQUEST_URI"];
$uriArray = explode('/', $uri);
$page_url = $uriArray[1];
$page_url2 = $uriArray[2];
echo $page_url; <- See the value
This is working great for me using PHP.
In Laravel, I'm using:
private function getValueFromString(string $string, string $key)
{
parse_str(parse_url($string, PHP_URL_QUERY), $result);
return isset($result[$key]) ? $result[$key] : null;
}
A dynamic function which parses string URL and gets the value of the query parameter passed in the URL:
function getParamFromUrl($url, $paramName){
parse_str(parse_url($url, PHP_URL_QUERY), $op); // Fetch query parameters from a string and convert to an associative array
return array_key_exists($paramName, $op) ? $op[$paramName] : "Not Found"; // Check if the key exists in this array
}
Call the function to get a result:
echo getParamFromUrl('https://google.co.in?name=james&surname=bond', 'surname'); // "bond" will be output here
I'm creating a object in javascript echo'd by PHP, the syntax seems to be correct but it is giving me an error.
The variables I am passing to the object are strings and I have tried putting them in quotes, etc. I also tried creating a JS function to do this and it had similar results.
<?PHP
$TEDS = $db->query("
SELECT a.*
FROM TEDS a
");
//Add each TED location into a javascript array.
echo '<script type="text/javascript">';
while($TED = $TEDS->fetch_assoc())
{
echo 'var pos = {lat: '.$TED['latitude'].', lng: '.$TED['longitude'].'};'; //THIS ECHO STATEMENT IS THE ONE GIVING ME PROBLEMS.
}
echo '</script>';
?>
It's highly likely that one of your latitude values does not have a value, causing it to print something like the following:
var pos = {lat: , lng: 1234}
Without a value to go with the property, the JavaScript parser would unexpectedly see the comma. This would greatly explain an unexpected comma syntax error.
So, first of all, you do NOT manually construct JSON. PHP has json_encode() that converts PHP arrays into JSON. Use that to correctly build JSON for you.
Next, your code prints pos repeatedly, overriding the previous values. If you only care about the last value, don't print everything. If you do care about all the values, store them in an array:
<?php
// Get your TEDS
$teds = $TEDS->fetch_assoc();
// Using array_map to convert the items from latitude-longitude to lat-lng.
$teds_array = array_map(function($ted) {
return ['lat' => $ted['latitude'], 'lng' => $ted['longitude']];
}, $teds);
// Serialize to JSON
$teds_json = json_encode($teds_array);
?>
// positions will be an array of objects with lat-lng.
var positions = <?php echo $teds_json; ?>
Lastly, be careful of XSS. Do not just print unsanitized values like above. Make sure your data is clean before printing it on the page.
i would try to write the full text, after the loop. This way you can build a full json array:
<?PHP
$TEDS = $db->query("
SELECT a.*
FROM TEDS a
");
//Add each TED location into a javascript array.
echo '<script type="text/javascript">';
$text = 'var positions = [';
while($TED = $TEDS->fetch_assoc()) {
$text .= '{lat: '.$TED['latitude'].', lng: '.$TED['longitude'].'},';
}
// remove last comma
$text = substr($text,0 , strlen($text)-2);
$text .= '];'
echo $text;
echo '</script>';
?>
Another way would be to just json_decode($TED).
currently, im having problem to parse xml node in array using condition where parse with <mo> as separator
this is my array(0)
Array([0] => <mi>x</mi><mo>+</mo><mn>2</mn><mo>=</mo><mn>3</mn>);
i want to parse like this
Array[0] => <mi>x</mi>
Array[1] =><mo>+</mo><mn>2</mn>
Array[2]=><mo>=</mo><mn>3</mn>
this is my coding
<?
$result(0)="<mi>x</mi><mo>+</mo><mn>2</mn><mo>=</mo><mn>3</mn>";
$result1= new simplexml_load_string($result);
$arr_result=[];
foreach($result1 as $key => $value){
$exp_key = explode('<', $key);
if($key[0] == 'mo'){
$arr_result[] = $value;
}
print_r($arr_result);
}
if(isset($arr_result)){
print_r($arr_result);
}
?>
thanks in advance !
The approach with XML seems excessive since what you really want is to pull out substrings of a string based on a delimiter.
Here is a working example. It works by finding the position of <mo> and cutting off that section, then searching for the next <mo> in the remain string.
<?php
$result(0)="<mi>x</mi><mo>+</mo><mn>2</mn><mo>=</mo><mn>3</mn>";
$res = $result(0);
$arr_result=[];
while($pos = strpos($res, "<mo>", 1)) {
$arr_result[] = substr($res, 0, $pos); // grab first match
$res = substr($res, $pos); // grab the remaining string
}
$arr_result[] = $res; // add last chunk of string
print_r($arr_result);
?>
Your code above has several issues.
First:
$result1= new simplexml_load_string($result); // simplexml_load_string() is a function not a class
Second:
$key and $value do not contain the '<' and '>' so, this part:
$exp_key = explode('<', $key); will never do anything and isn't needed.
Third:
If your code did work it would only return array('+', '=') because you are appending the data inside the mo element to the result array.
This is for server side, regardless of client.
$data= file_get_contents('textfile.txt');
The textfile.txt contains
var obTemperature = "55";
var obIconCode = "01";
What can I enter so I can get echo obTemperature value of 55?
is there not a simple php interface to read var values by name?
please no over complicated /half answers /trolling,
You would be better off explaining what you want to do in general, but if you are tied to this file format and the format is consistent:
$data = str_replace('var ', '$', $data);
eval($data);
echo $obTemperature;
echo $obIconCode;
However, any other types of JavaScript code will cause a parse error.
Also, you can treat it as an ini file:
$data = str_replace('var ', '', parse_ini_string($data));
echo $data['obTemperature'];
Or just:
$data = parse_ini_string($data);
echo $data['var obTemperature'];
You can use a regular expression:
preg_match('/var obTemperature = "(\d+)";/', $data, $match);
$temperature = $match[1];
DEMO
I know there are existing some Questions about Chunking a mysql array in php, but my problem is, that I want to keep the output in JSON.
Scenario:
I want to get data from mysql, do some stuff with it ( like time formatting ) and output it in JSON.
The JSON data is parsed in the browser and visualized over a javascript chart.
Problem:
All of the above is working, but because of the huge amount of data, I'm getting an out of memory error, when I select bigger date ranges to output.
The Idea of directly sending out each x-lines of data is not working because of the JSON format it needs to be. Several JSON chunks won't work, it needs to be one for the chart.
So in the end I need to chunk the data but keep it as one big JSON.
(And setting up the memory limit is not really a solution.)
Ideas:
One Idea would be, to let the browser chunk the date range and ask the data as chunks & then put them together.
Of course this would work, but if there is a way to do this server side, it would be better.
Code:
private function getDB($date1, $date2){
$query = 'SELECT * FROM `db1`.`'.$table.'` WHERE `date` BETWEEN "'.$date1.'" AND "'.$date2.'" order by `date`;';
// date = datetime !
$result = $this->db->query($query);
$array = array();
while ( $row = $result->fetch_assoc () ) {
$array[] = array( strtotime($row[ 'date' ])*1000 , (float)$row[ 'var' ] );
// the formatting needs to be done, so the chart accepts it..
}
$result->close();
return json_encode($array);
}
Since this is not an option,
ini_set("memory_limit","32M")
perhaps you can add LIMIT to the function paramaters and query:
private function getDB($date1, $date2, $start, $pageSize){
$query = 'SELECT * FROM `db1`.`'.$table.'` WHERE `date` BETWEEN "'.$date1.'" AND "'.$date2.'" order by `date` LIMIT $start, $pageSize;';
// date = datetime !
$result = $this->db->query($query);
$array = array();
while ( $row = $result->fetch_assoc () ) {
$array[] = array( strtotime($row[ 'date' ])*1000 , (float)$row[ 'var' ] );
// the formatting needs to be done, so the chart accepts it..
}
$result->close();
return json_encode($array);
}
Then setup a for loop in javascript, call this with Ajax, incrementing the $start variable each time.
Store each responseText.substr(1).substr(-1) in an array.
When the responseText is "", all of the records have been returned.
.join the array with a comma, then add a new opening and closing "{ }", and you should have a JSON equivalent to all records.
Minimal parsing, and you'll be using built-in functions for most of it.
var startRec=0;
var pageSize=50;
var xmlhttp=new XMLHttpRequest();
var aryJSON=[];
var JSON;
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200){
if(xmlhttp.responseText==""){ //Might need to check for "{}" here instead of ""
//All records are received
JSON="{" + aryJSON.join(",") + "}";
aryJSON=[];
startRec=0
}else{
aryJSON.push(xmlhttp.responseText.substr(1).substr(-1));
startRec+=pageSize;
getNextPage();
}
}
}
function getNextPage(){
xmlhttp.open("GET","your.php?start=" + startRec + "&pageSize=" + pageSize,true);
xmlhttp.send();
}
I would recommend that you have the server send the browser exactly what it needs to create the table. Parsing can be a heavy task, so why have the client do that lifting?
I would have your backend send the browser some kind of data structure that represents the table (i.e. list of lists), with all the formatting already done. Rendering the table should be faster and less memory-intensive.
One way of answer would be, to do the chunking on the server, by giving out the JSON, removing the leading [ & ].
#apache_setenv('no-gzip', 1);
#ini_set('zlib.output_compression', 0);
#ini_set('implicit_flush', 1);
$array = array();
echo '[';
$started = false;
while ( $row = $result->fetch_assoc () ) {
$array[] = [ strtotime($row[ 'datetime' ])*1000 , (float)$row[ 'var' ] ];
if(sizeof($array) == 1000){
if($started){
echo ',';
}else{
$started = true;
}
echo substr(substr(json_encode($array),1), 0, -1);
// converting [[datetime1, value1],[datetime2, value2]]
// to [datetime1, value1],[datetime2, value2]
ob_flush();
$array = array();
}
}
if($started)echo ',';
$this->flushJSON($array);
echo ']';
flush();
$result->close();
This is working and reducing the ram usage to 40%.
Still it seems that Apache is buffering something, so the ram usage increases over the time, the script is running. (Yeah, the flush is working, I debugged that, that's not the problem.)
But because of the remaining increase, the fastest way to achieve a clean chunking is to do this like alfadog67 pointed it out.
Also, to mention it, I had to disable the output compression, otherwise apache wouldn't flush it directly..