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PHP - String Based Math
question here...
say we have a string coming from a form, already verified that its numeric/mathmatical(+-*/) how can we then process that into an answer without using eval? Code: [Select] $string='1+2*3'; echo process($string); #7 Quote If eval() is the answer, you're almost certainly asking the wrong question. -- Rasmus Lerdorf, BDFL of PHP Similar TutorialsHey there, Thanks for taking the time to read my thread. My issue is that I can't think of a way to edit a XML file using PHP's XML functionality and then assign the edited contents to a string instead of saving the file. Because my issue is that I have to edit the XML file based upon a string brought from a remote location then give it back to that remote location using a string again, to be exact I am doing it via Linux command line utilizing SSH2. This is what I managed to complete on my own. function CheckIVMPConfig($ServerID) { global $Panel; if(is_numeric($ServerID) && $this->IsValidServer($ServerID)) { // We select the game server that the FTP account was created for. $Servers = mysql_query("SELECT * FROM control_servers WHERE server_id = '".mysql_real_escape_string($FTPAccount['ftp_server'])."'"); $Server = mysql_fetch_array($Servers); // Here we select the Box ID that the game server is on. $Boxs = mysql_query("SELECT * FROM control_machines WHERE machine_id = '".$Server['server_machine']."'"); $Box = mysql_fetch_array($Boxs); // Now we select the required package for the box. $Packages = mysql_query("SELECT * FROM control_packages WHERE package_id = '".$Server['server_package']."'"); $Package = mysql_fetch_array($Packages); // Retrive the file. $Config = $CProtocol->exec("cat /home/{$Server['server_id']}/{$Package['package_config']}"); $Parse = SimpleXMLElement($Config); foreach($Parse as $Entry) // loop through our books { if($Entry->port != $Server['server_port']) { // edit the value } else if($Entry->maxplayers > $Server['server_slots']) { // edit the value } } } } Given a text value $path, I want to return the actual path. One option is a switch statement as shown below. Another option is put them in an associated array (or maybe a static array?) and check if the element is set and if not throw an deception. Or maybe a totally different solution. Is one solution better (i.e. more efficient) than another? I will probably be retrieving a path around 5 times for every server hit. Thanks
function getPath($path)
{
switch($path){
case 'classes': $path=__DIR__;break;
case 'application': $path=dirname(__DIR__);break;
case 'root': $path=dirname(dirname(__DIR__));break;
case 'twig': $path=dirname(dirname(__DIR__)).'/vendor/autoload.php';break;
case 'lib': $path=dirname(__DIR__).'/lib';break;
case 'help': $path=dirname(__DIR__).'/lib/help';
case 'templates': $path=dirname(__DIR__).'/lib/templates';
case 'htdocs_base': $path=dirname(dirname(__DIR__)).'/html';
case 'resources_base': $path=dirname(dirname(__DIR__)).'/user_resources';
// About 10 more
default: throw new Exception("Path {$path} not valid.");
}
return $path;
}
Hi Folks, This is my first post here and I was wondering if anyone could help me out at all please. I would basically like to change the logo on the home page based on whether a query string from a referring URL has a specific value. It's an affiliate URL for an online store, so essentially I need to get the referrer, check if the query string adnetwork = as and then replace the logo if it does, if not leave it as it is. Does that make sense? Any help would very much appreciated. I was thinking along the lines of: <?php if ($_GET('adnetwork') == 'as') { changeLogo(); } else { leaveLogo(); } ?> Am I along the right lines folks? I'm trying to make a script to check a files date time and if its under so many seconds long the page will refresh. here is what I've got. I've been testing the output of the date() functions but when i do the math all i get is a 0. where did i go wrong? is it just i can't do math with dates? Thanks in advanced. Code: [Select] <html><head> <meta http-Equiv="Cache-Control" Content="no-cache"> <meta http-Equiv="Pragma" Content="no-cache"> <meta http-Equiv="Expires" Content="0"> <? $proFile = "profilePics/profile.jpg"; //if ( date ("m d Y H:i:s.") - date ("m d Y H:i:s.", filemtime($proFile)) <= 00 00 0000 00:00:04 ){ //this is where the magic should happen. //echo "<meta http-equiv="refresh" content='4'>"; } ?> </head> <? echo date ("m d Y H:i:s."); echo "<br>"; echo date ("m d Y H:i:s.", filemtime($proFile)); echo "<br>"; echo date ("m d Y H:i:s.") - date ("m d Y H:i:s.", filemtime($proFile)); //only outputs 0 ?> Hi guys. I'm using php to randomly generate a simple math verification question. But, I'm having a hard time validating the input. Can someone please tell me what I'm doing wrong? Thank you } else if(trim($verify) != $_SESSION['UserData']['Math'][0]+$_SESSION['UserData']['Math'][1]){ $error = '<div class="error_message">Attention! The verification number you entered is incorrect.</div>'; } <?php echo "<span class='label'><span class='required'>*</span>What is ".$_SESSION['UserData']['Math'][0]." + ".$_SESSION['UserData']['Math'][1]."?</span> "; ?> <input name="verify" type="text" id="verify" size="3" value="<?=$verify;?>" /><br /><br /> Trying to get the percentage of rent for a property in php. Im completely lost .... Code: [Select] <?php $purchase = 44000; $rent = 9860; $percent = $purchase * $rent; //this is wrong, it returns 4.3 but should be over 18 echo "Percentage is {$percent}%"; ?> I am trying to create a math equation inside a variable but I am struggling to achieve the desired result. On one php page I have this:
$x = "date('Y')"; On my main page I have linked to the above and also $description but the result I am getting is: In this classic lecture which was delivered over date('Y') - 1989 years ago,
I want to create a variable so I don't need to go back every year and change the description. Is this possible? Robert
Hi, I am TheMeq. I am currently developing a Text-Based MMORPG in PHP/MySQL. I have quite alot of the code laid down, its just this bit that is starting to throw me a bit. I've been working on it since 8am this morning.. it is now 4:30pm and i think it's nearly there. It's just not working the way I would like. So if I was to ask for help, should I just post what code I have? Hello Everyone, I'm a newbie trying to improve my script below. The script works fine but I would like to add the 3 radio buttons computations enhancements Ergo, if a user chooses 'Matte Paper" a 10% would be added to the Price Quote result. If a user chooses ' Gloss Paper, a 10% would be added to the Price Quote result. If a user chooses 'Canvas" , a 20 % would be added to the Price Quote result. If someone could assist with the math or post me a helpful link it would be greatly appreciated. Thank you. Paul from Melbourne, Australia. <div style="border:dashed 1px; width:570px;"> <form method="post" action="<?php echo $_SERVER['php_SELF'];?>"> <p> 1. Enter the size (100w.x180h. cm) you want your picture printed: Width <input type="text" name="width" size="1" maxlength="3" value="0" onFocus="this.value=''; this.style.color='#ff0000';"> Height <input type="text" name="height" size="1" value="0" maxlength="3" value="0" onFocus="this.value=''; this.style.color='#ff0000';"> </p> <p> 2. Choose the printing material for your pictu <input type="radio" value="cms in Matte paper" name="material" size="3" maxlength="3" /> Matte Paper <input type="radio" value="cms in Gloss Paper:" name="material" size="3" maxlength="3" /> Gloss Paper <input type="radio" value="cms in Canvas:" name="material" size="3" maxlength="3" /> Canvas </p> <p> 3. Submit your info for our Price Quote below : <input type="submit" name="submit" value="Submit" /> or: <input type="submit" name="clear" value="Reset" /> </p> <p> 5. Our Price Quote to print your artwork sized: <?php $width = $_POST['width']; /* if artwork wider than 101 cm no quote, exits*/ if ($width >=101) {echo "Error!"; exit ;} $height = $_POST['height']; /* if artwork higher than 181 cm no quote, script exits */ if ($height >=181) {echo "Error!"; exit ;} $measurement = $_POST['measurement']; $material = $_POST['material']; $result = $width * $height; echo " $width x $height $material is: "; echo "$".number_format($result,2). "" ; ?> </p> </form> </div> is there a math function that give you an integer value when u divide 2 numbers? ie in 7/3 i just want 2 as a result not floating number. thanks in advance. Good day, I have problem on subtracting time. Can anyone give me a hint how will I going to do that.
I already manage to get the SUM on time addition using this method.
$data = array('1:52:37','9:56:39','08:04:22','05:32:20');
echo convertTime($data); - ANSWER 25:25:58
function convertTime($data){
$seconds = null;
$minutes = null;
$hours = null;
foreach($data as $key => $value){
$time1 = explode(':',$value);
list($h[$key],$m[$key],$s[$key]) = $time1;
$seconds += $s[$key];
$minutes += $m[$key];
$hours += $h[$key];
}
$total_sec_min = intval($seconds / 60);
$total_seconds = $seconds % 60;
#$total_seconds;
$total_minutes = $minutes % 60;
if($total_sec_min > 0){
$total_minutes = $total_minutes + $total_sec_min;
}
$total_min_hr = intval($minutes / 60);
$total_hours = $hours;
if($total_min_hr > 0){
$total_hours = $total_hours + $total_min_hr;
}
return $total_hours.':'.sprintf("%02s",$total_minutes).':'.sprintf("%02s",$total_seconds);
}
But I really got hard time when it comes to subtraction.
Website: http://novacms.vacau.com/index.php I'm trying to make a calculator for this game I play, it's fully developed, but with one bug. It doesn't do the math right. $goal = The amount of EXP (Experience Points) someone wants to get $exp = The amount of EXP they currently have $npcs_exp["exp"] = The amount of EXP the monster has But, when they enter in the information, the calculation is all screwed up. When I do it, it seems to give me the same number EACH time. The part where the calculation "goes down". Remember, I'm trying to see how many times you need to kill a NPC to achieve your goal. //math $npc_exp_extract = mysql_query("SELECT exp FROM npcs WHERE name='$npc'"); $npcs_exp = mysql_fetch_assoc($npc_exp_extract); $amount = $goal / $npcs_exp["exp"]; Full code: <?php $exp = $_POST["exp"]; $npc = $_POST["npc"]; $goal = $_POST["goal"]; mysql_connect("removed", "removed", "removed"); mysql_select_db("a2248602_npcs"); if(!$goal || !$npc || !$exp) { echo "<center><form action='index.php' method='POST'>GOAL: <input type='text' name='goal'> Current XP: <input type='text' name='exp'>"; echo "NPC: <select name='npc'>"; $npc_extract = mysql_query("SELECT * FROM npcs"); while($npcs = mysql_fetch_assoc($npc_extract)) { echo "<option name='". $npcs['name'] ."'>". $npcs['name'] ."</option>"; } echo "</select> <input type='submit'></form></center>"; } else { //math $npc_exp_extract = mysql_query("SELECT exp FROM npcs WHERE name='$npc'"); $npcs_exp = mysql_fetch_assoc($npc_exp_extract); $amount = $goal / $npcs_exp["exp"]; if($amount=="1") { echo "You will need to kill a <b/>". $npc ."</b> <b>". $amount ."</b> more time. You earn ". $npcs_exp["exp"] ." XP for each kill from this NPC. | <a href='index.php'>Do another</a><br/><br/>"; } else { echo "You will need to kill a <b/>". $npc ."</b> <b>". $amount ."</b> more times. You earn ". $npcs_exp["exp"] ." XP for each kill from this NPC. | <a href='index.php'>Do another</a><br/><br/>"; } } echo "<center>Made by Zaros from <a href='creation-x.net'>Creation-X</a></center>"; ?> Mod edit: DB credentials removed. I can not seem to figure out how to do this.. I just need to add 100+99+98+97+96...+1 no you can not do 100! because that multiples them =] Hello all. Trying this again. I would like to implement a simple math formula based on a date, but not sure how to do that exactly. I run a sports league, and want to calculate fees based upon a fixed date. Prior to 'some date' use this calculation, but after this date, add late fees using 2nd calculation. In my code there are two fields: $earlyteam and $lateteam. I need $lateteam to kick in after 'some date'. Help? Code: [Select] //calculate Fees $size = $lSize['size']; switch($size) { case 2: $base = 150; $size = 3; break; case 4: $base = 330; $size = 6; break; case 6: $base = 550; $size = 10; break; default: die ("invalid league size"); }; $earlyTeam = $base; { $e_each = $earlyTeam / $pCount; $lateTeam = $earlyTeam * 1.10; $l_each = $lateTeam / $pCount; } What is the correct way to right a simple maths question i have my total as: <?php echo $row['total'];?> i have my another number as: <?php echo $row['user_credit']; ?> but what i want to do is subtract the user_credit from the total and save it as a new variable called 'credits_used' but im unsure how to write it do i do it like $row['total'] - $row['user_credit'] = $row['credit_used']; Thank for any help The title may not fit but only thing i could think of. I am pulling data from MSSQL database table.... I need everything from that table but i need to do some basic math funcitons to the resulting data. So the quesiton is should i do the math for this in the SQL query if so how do i pull all fields and do the math in an effcient way. Or should i let php do the math for me after i get all the data i need. If it is better to use php how can i do this in a while loop and get the math result and not a printed equation. Just looking for a few pointers never had to do math before with php I am doing some simple math and it is spitting out very odd results. //First Loop to get the values $get_values = mysql_query("SELECT * FROM table"); while($values = mysql_fetch_array)){ $value_one += $values[value_one]; $value_two += $values[value_two]; } $difference = $value_one - $value_two; echo"$value_one - $value_two = $difference; The database field types are DECIMAL(10,2). The output of the individual values is echoing the correct 0.00 format but after it loops for awhile the difference seems to come out differently. and have close to 5 or 6 places after the decimal. if i echo the values as it is looping and adding them it seems to not be adding correctly either. What am I doing wrong? This topic has been moved to PHP Math Help. http://www.phpfreaks.com/forums/index.php?topic=310665.0 I'm using this code to get me the variables to a select box on a register page: $vars['user-birthdate-years'] = array(_VARS_USER_CHOOSE_ => "Please choose", _VARS_USER_NONE_ => _VARS_USER_UNDEF_); for ($i = date('Y') - 18; $i > date('Y') - 75; --$i) { $vars['user-birthdate-years'][$i] = "$i"; } This gives me this result in the page source: <select name="birthyear" class="date"><option value="-2" selected="selected">Please choose</option><option value="1997">1997</option><option value="1996">1996</option><option value="1995">1995</option><option value="1994">1994</option><option value="1993">1993</option><option value="1992">1992</option><option value="1991">1991</option><option value="1990">1990</option><option value="1989">1989</option><option value="1988">1988</option><option value="1987">1987</option><option value="1986">1986</option><option value="1985">1985</option><option value="1982">1982</option><option value="1981">1981</option><option value="1980">1980</option><option value="1979">1979</option><option value="1978">1978</option><option value="1977">1977</option><option value="1976">1976</option><option value="1975">1975</option><option value="1974">1974</option><option value="1973">1973</option><option value="1972">1972</option><option value="1971">1971</option><option value="1970">1970</option><option value="1969">1969</option><option value="1968">1968</option><option value="1967">1967</option><option value="1966">1966</option><option value="1965">1965</option><option value="1964">1964</option><option value="1963">1963</option><option value="1962">1962</option><option value="1961">1961</option><option value="1960">1960</option><option value="1959">1959</option><option value="1958">1958</option><option value="1957">1957</option><option value="1956">1956</option><option value="1955">1955</option><option value="1954">1954</option><option value="1953">1953</option><option value="1952">1952</option><option value="1951">1951</option><option value="1950">1950</option><option value="1949">1949</option><option value="1948">1948</option><option value="1947">1947</option><option value="1946">1946</option><option value="1945">1945</option><option value="1944">1944</option><option value="1943">1943</option><option value="1942">1942</option><option value="1941">1941</option></select> Problem: When running the php code at the top it miss two years in the span as you see in the page source below, the year 1983 and 1984 is completely missing in the page source. Why is this happening, could the php code be corrected or is there a workaround in php for the missing years bug I seem to have found? I really appreciate any help on this! Edited by Drezzzer, 12 January 2015 - 05:16 AM. This topic has been moved to PHP Math Help. http://www.phpfreaks.com/forums/index.php?topic=357542.0 |
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