Forum Moderators: coopster
www.webmasterworld.com/forum21/3697.htm
and i find some simple php scripts that are very cheesey and said to myself why didn't i think about that!
How about posting your php tricks on your site like link management or everything under the sun which would be very helpful for all in creating dynamic sites and even for newbies.
peace. :)
[edited by: jatar_k at 4:10 pm (utc) on Mar. 29, 2003]
hmmm, tricks.
how about a little one to start. When you want to echo a var instead of using
<? echo $var;?>
use
<?= $var?>
a little quicker.
<?
$str1 = "First half of the sentence";
$str2 = "and the second half.";
print "<html>
<head><title>Try It</title>
</head>
<body>
$str1 $str2
</body>
</html>";
?>
... the formatting of the code source will be as it appears in the php.
print_r($your_array);
..will result in this format:
Array ( [0] => value [1] => value [2] => value )
-or-
Array ( [key] => value [key] => value [key] => value )
Works on multi-dimensionals too.
$text=<<<EOF
<html>
blah
$someVar
blah
</html>
EOF;
Nick
How about posting your php tricks on your site like link management or everything under the sun which would be very helpful for all in creating dynamic sites and even for newbies.
That is exactly what I do since the last year. I collect all my little answers to questions in newsgroups, mailinglists, forums and boards and publish them on my Web site. Users are able to write comment - sometimes they enhance code or suggestions and sometimes they say just thanks ;)
It's a good thing - help other webmasters and building content for your site.
NN
echo '<pre>';
print_r($your_array);
echo '</pre>';
will work better for bigger arrays.
Andreas
Use single quoted strings unless you need to interpolate variables into your string. This saves PHP the time to scan the string for contained variables and saves about 50% execution time.
data
double quotes: 0.001505970954895
single quotes: 0.00078308582305908
difference...: 0.00072288513183594
benchmark
function getmicrotime($t) {
list($usec, $sec) = explode(" ",$t);
return ((float)$usec + (float)$sec);
}
#
$start = microtime();
$a = array();
for($i=0;$i<100;$i++) {
array_push($a, "Aaron rules!");
}
$end = microtime();
$t1 = (getmicrotime($end) - getmicrotime($start));
echo "<pre>double quotes: $t1<br>";
#
unset($a);
#
$start = microtime();
$b = array();
for($i=0;$i<100;$i++) {
array_push($b, 'Aaron rules!');
}
$end = microtime();
$t2 = (getmicrotime($end) - getmicrotime($start));
$t3 = $t1-$t2;
echo "single quotes: $t2<br>difference...: $t3</pre>"; Andreas
Use concatenation [php.net] rather than sprintf() [php.net]. Use sprintf [php.net] rather than interpolation [php.net].
Use sprintf [php.net] to build more complex strings such as SQL query strings.
data
concatenation: 0.0008620023727417
sprintf......: 0.0017820596694946
interpolate..: 0.002047061920166
benchmark
$x = 'Aaron';
$y = 'C.';
$start = microtime();
for($i=0;$i<100;$i++) {
$a = $x . $y . ' rules!<br/>';
}
$end = microtime();
$t1 = (getmicrotime($end) - getmicrotime($start));
echo "<pre>concatenation: $t1<br>";
#
unset($a);
#
$start = microtime();
for($i=0;$i<100;$i++) {
$a = sprintf('%s %s rules!<br/>', $x, $y);
}
$end = microtime();
$t1 = (getmicrotime($end) - getmicrotime($start));
echo "<pre>sprintf......: $t1<br>";
#
unset($a);
#
$start = microtime();
for($i=0;$i<100;$i++) {
$a = "$x $y rules!<br/>";
}
$end = microtime();
$t2 = (getmicrotime($end) - getmicrotime($start));
$t3 = $t1-$t2;
echo "interpolate..: $t2<br>difference...: $t3</pre>";
comments
This is useful for all those who need to decide how to build their SQL strings since there is no way to prepare a statement using placeholders like there is in Perl using the DBI module.
While the concatenation method is the fastest it is hard to read and it scales not as good as the sprintf method. Look at the data using four variables:
concatenation: 0.0012750625610352
sprintf......: 0.0018420219421387
interpolate..: 0.0027940273284912
Andreas
Use push/join rather than concatenation.
data
using concat: 0.00052297115325928 seconds
using array.: 0.00033998489379883 seconds
difference..: 0.00018298625946045 seconds
benchmark
$x = array('Taylor','Zac','Isaac','Leo','Aaron','Nick','Scott',
'Dave','Bob','Clint','Chris','Thomas','Ryan','Dennis',
'Thimo','Steve');
#
$s1 = microtime();
foreach($x as $val) {
$s .= $val . ', ';
}
$e1 = microtime();
#
unset($s);
$s = array();
#
$s2 = microtime();
foreach($x as $val) {
array_push($s, $val);
}
$y = implode(', ', $s);
$e2 = microtime();
#
$t1 = (getmicrotime($e1) - getmicrotime($s1));
$t2 = (getmicrotime($e2) - getmicrotime($s2));
$td = $t1 - $t2;
#
echo "<pre>using concat: $t1 seconds<br>
using array.: $t2 seconds<br><br>
difference..: $td seconds</pre>"; Andreas
<?
if (!($HTTPS == "on")) {
header ("Location: [$SERVER_NAME$PHP_SELF");...]
exit;
}
?>
Returns the string "msec sec" where sec is the current time measured in the number of seconds since the Unix Epoch (0:00:00 January 1, 1970 GMT), and msec is the microseconds part.
Shouldn't you convert one var to match the other?
<edited>never mind I just figured it out</edited>
i find your scripts cool and that is what i meant when i say cheesey ... and i love cheese :)
thanks for the post everyone, lets keep it coming.
Variable variables [php.net]
very useful tool.
I know you had no ill intentions, I was just trying to stir it up a little bit when I said that!
No hard feelings! :)
trick:
For outputting text with variables, use the little-known fact that echo allows several arguments, instead of concatenation or double quotes (which are twice as slow!):
echo 'text', $var, 'more text', $anothervar;
data:
commas.......: 0.0024470090866089
concatenation: 0.0028690099716187
double quotes: 0.0044499635696411
script:
<?
$x = 'H.'; $y = 'J.'; $z = 'O.';
$start = microtime();
for($i=0;$i<100;$i++) { echo $x, ' ', $y, ' ', $z, ' rules! '; }
$end = microtime();
$t1 = (getmicrotime($end) - getmicrotime($start));
unset($a);
#
$start = microtime();
for($i=0;$i<100;$i++) { echo $x.' '.$y.' '.$z.' rules! '; }
$end = microtime();
$t2 = (getmicrotime($end) - getmicrotime($start));
unset($a);
#
$start = microtime();
for($i=0;$i<100;$i++) { echo "$x $y $z rules! "; }
$end = microtime();
$t3 = (getmicrotime($end) - getmicrotime($start));
unset($a);
#
echo "<pre>commas.......: $t1<br></pre>";
echo "<pre>concatenation: $t2<br></pre>";
echo "<pre>double quotes: $t3</pre>";
function getmicrotime($t) {
list($usec, $sec) = explode(" ",$t);
return ((float)$usec + (float)$sec);
}
?>
But donīt you think commata sounds so much nicer than commas. ;)
Iīm wondering who H.J.O might be? (Ha. Jo. Os. perhaps? Thatīs what Google suggested. If so then I have my doubts as to the truth value of such a statement as your script would produce. ;))
Andreas
There must be an expression of some kind in an array's [].
$arr_foo[1];
That expression can be generated by a function, and the contents of the [], the expression, can be the function itself. So why not a function that returns a boolean result?
To wit:
With this array...
$colour = array("red","green");
And this function...
function which($x,$y){
return $x < $y;
}
You could echo your array thusly...
echo $colour[which($x,$y)];
With input from whatever...
$x = 4;
$y = 7;
And end up with "green" or "red" depending on the size relation of the two numbers.
But wait! There's more!
You could then add this array to the bgcolor of a table cell...
<table width="15%" border="0">
<tr>
<td bgcolor=<?=$colour[which($x,$y)];?>>
<br>
</td>
</tr>
</table>
And get a green light (Starboard!) or red (Make way, yuh swab.) all on the luck of the draw.
;)
Andreas
Write a function...
function foo() {echo "You called foo()<br>\n";}
Stick it n a variable...
$func1 = foo();
And call the variable as a function...
$func1();
-o-
If the function takes an argument...
function bar($arg = '') {echo $arg . "ing! This is bar()<br>\n";}
So will the variable function (or should that be 'function variable'?)...
$func2 = bar();
$func2('Test');
NB - $10 to the first person who can find a good use for it.
(Jatar's paying)
variable functions, I am not totally sure what types of functions would need to be variable.
10$ CDN really isn't very much money to most of you. ;)
Write a function...
function foo() {echo "You called foo()<br>\n";}Stick it n a variable...
$func1 = foo();And call the variable as a function...
$func1();
This wonīt work the way you expect. In the line $func1 = foo(); $func1 is assigned the return value of foo. Since foo does not return anything $func1 does not contain a name of a function to call. This will result in an Call to undefined function error.
To use variable functions [php.net] in PHP all you do is assign the name of a function to call to a variable.
$func1 = 'foo';
This will work without the quotation marks as well (Due to the lack of any special meaning the bare word foo will be interpreted as a literal string) but you shouldnīt do that.
I am not totally sure what types of functions would need to be variable
This is what php.net has to say about the possible uses of variable functions:
Among other things, this can be used to implement callbacks, function tables, and so forth.
Andreas
<?php
#
if (!isset($_GET['page']) or empty($_GET['page']))
$_GET['page'] = 'index';
#
$pages = array('index' => create_function('', 'echo "index";'),
'aaron' => 'aaron',
'jesse' => create_function('', <<<END
echo 'Jesse rules';
END
));
#
function aaron() {
echo "Aaron $args rules";
}
#
if (function_exists($pages[$_GET['page']])) {
$pages[$_GET['page']]();
} else {
echo 'page does not exist';
}
#
?>
One may build the function table prior to defining the functions since all one does is assign the name of a function. Resolution of which function to call is done at runtime. Variable functions are not function pointers nor are they references to functions.
If you call this script as script.php or script.php?page=index you get the index page. If you call it as script.php?page=aaron or script.php?page=jesse you get Aaronīs or Jesseīs page respectively. If you call it as script.php?page=nick there exists no corresponding function and the error message 'page does not exist' is displayed.
Andreas
function foo() {echo "You called foo()<br>\n";}
function bar($arg = '') {echo $arg . "ing! This is bar()<br>\n";}
$func = 'foo';
$func();
$func = 'bar';
$func('Test');
Jatar: how much is $10 in Euros?
10 Canadian Dollar = 6.27 Euro
I failed to find a currency converter that uses GET to to transfer the data.
Andreas
