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Lorsque PHP commence � traiter un fichier, il ne fait qu'afficher
le texte HTML qu'il rencontre. Si vous renommez un fichier .html
en .php, il s'affichera exactement comme avant.
Si vous voulez ins�rer des commandes PHP dans votre fichier, vous
devez indiquer � PHP le d�but d'une telle s�quence,
en passant en mode PHP. Il y a quatre moyens pour passer du mode HTML au
mode PHP :
Exemple 5-1. Le passage du HTML au PHP 1. <? echo ("Ceci est un exemple d'affichage � l'�cran en PHP, sous forme d'expression SGML.\n"); ?>
<?= expression ?> Raccourci de "<? echo expression ?>"
2. <?php echo("Si vous voulez afficher du XML ou du XHTML, faites comme ceci.\n"); ?>
3. <script language="php">
echo ("Certains �diteurs HTML (comme FrontPage)
n'acceptent pas les expressions telles que celle-ci.");
</script>
4. <% echo ("Vous pouvez aussi utiliser le style ASP comme d�limiteur."); %>
<%= $variable; # ceci est un raccourci pour "<%%echo .." %> |
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La deuxi�me m�thode est g�n�ralement utilis�e,
car elle permet une impl�mentation ais�e de PHP avec la
prochaine g�n�ration de XHTML.
La premi�re possibilit� n'est valable que si vous
l'avez activ�e. Soit en faisant appel � la fonction
short_tags() (NdT : semble avoir disparu), soit en utilisant l'option
d'ex�cution short_open_tag
dans le fichier de configuration, soit en utilisant l'option de
compilation --enable-short-tags.
La quatri�me possibilit� est seulement disponible
si vous l'avez activ�e en utilisant soit l'option
d'ex�cution asp_tags,
soit en utilisant l'option de compilation --enable-asp-tags.
Note�:
Le support de la quatri�me possibilit�,
ASP-style, a �t� ajout� dans la
version 3.0.4.
La marque de fermeture d'un bloc (?>) comprend la nouvelle
ligne suivante, s'il y en a une.
PHP vous permet d'utiliser des structures telles que :
Exemple 5-2. M�thode avanc�e <?php
if ( expression-bool�enne ) {
?>
<strong>Ceci est vrai.</strong>
<?php
} else {
?>
<strong>Ceci est faux.</strong>
<?php
}
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Cela fonctionne comme on peut s'y attendre, car PHP traite le texte
entre ?> et <?php comme une fonction echo(),
sans remplacer les variables �ventuelles par leur valeur.
User Contributed Notes
La syntaxe de base |
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[email protected]
03-Jan-2001 08:35 |
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[Ed Note: this was fixed in 4.0.5 [email protected]]
If you're
using a MacOS text editor, such as BBEdit, for composing your PHP, you'll
want to save your files with Unix line breaks.
This fixes the
"error on line 1" problem where PHP's error system doesn't
recognize the MacOS line breaks properly. It will also allow you more
flexibility in creating multi-line SQL statements.
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11-Oct-2001 06:34 |
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I use FrontPage 2000 exclusively for creating my PHP documents. I use the
<% %> style syntax. I can put code anywhere, before head (as is
required for cookie data) and anywhere else in between. Using advanced
flow control, i can design an entire page in html, and then put PHP
control statements around it. This is much easier than <% echo %>
commands. You can drop in/out of PHP at ANY time, and the only reason to
ever use <% echo %> is for variables. Save yourself some hassle and
write your html in html and avoid the echo mess.
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[email protected]
12-Dec-2001 06:36 |
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[Ed Note:
This is because of short_tags, <?xml turns php parsing on,
because of the <?.
[email protected]]
I am moving my site
to XHTML and I ran into trouble with the <?xml ?> interfering with
the <?php ?> method of escaping for HTML. A quick check of the
mailing list confirmed that the current preferred method to cleanly output
the <?xml ?> line is to echo it:
<?php
echo("<?xml version=\"1.0\"
encoding=\"UTF-8\"?>\n"); ?>
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[email protected]
16-Jan-2002 07:40 |
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Under php 3.0.14 :
if you have a line like this :
echo "?>
written to file";
And you wish to comment this line, you'll do
this :
//echo "?> written to file";
But this will
generate a parse error at the end of script (even if this line was in an
include script).
Why? because '?>' is ignored as long as it is
inside "".
But once you've commented, the echo function is
ignored, and '?>' takes its signification : end of script!
I
guess it was corrected on next version, but if you run under php 3.0.14 be
careful, it make me loose a lot of time!
Paquerette
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dave@[nospam].netready.biz
18-Mar-2002 10:21 |
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A little "feature" of PHP I've discovered is that the <?PHP
token requires a space after it whereas after the <? and <% tokens a
space is optional.
The error message you get if you miss the space
is not too helpful so be warned!
(These examples only give a
warning with error_reporting(E_ALL) )
<?PHP/*<Some
HTML>*/?> fails...
<?/*<Some HTML>*/?> works...
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[email protected]
17-Jun-2002 06:50 |
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I can't find out how to break the line in the middle of a function. I have
tried the standard Unix '\' continuation trick, but that doesn't work.
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[email protected]
18-Jun-2002 08:51 |
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if you're experiencing problems with php PIs when generating creating
mixed php/html content with e.g. an XSLT processor in html output
mode:
it's not the processors fault.
an _SGML_ processing
instruction is actually written as <?php ..>, i.e. without a
trailing question mark.
<xsl:processing-instruction
name="php">
echo
$hello;
</xsl:processing-instruction>
will therefor not not
work like it should.
a sane solution to work around this is
generating <script> tags instead.
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[email protected]
09-Jul-2002 08:42 |
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also, if you're using Mac OS X...i highly suggest looking into Dreamweaver
MX. it's been a DREAM in learning and using PHP. no problems with line
breaks. it also colors your code based on the codes type and has pop-up
tips on what goes in certian brackets and functions. really sharp...
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[email protected]
15-Jul-2002 10:37 |
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Need help how I can build a mysql fot php to get a localhost ??
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15-Jul-2002 03:42 |
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You don't need the closing tag if you don't plan to add html (or something)
afterwards. This works (but the ; must be there):
<? phpinfo();
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[email protected]
15-Jul-2002 06:45 |
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Ich habe hier einen Code der mir egentlich sagen m�sste: Ihr letzter
versuch war am...
Er funktioniert aber nicht, deshalb gebe ich in hier
rein, falls mir irgendjemand diesen Code richtigstellen kann, sollte er
mir bitte ein mail schicken.
Hier der
Code:
<?php
$lastvisit =
$http_COOKIE_VARS
[,,lastvisit��];
if (!$lastvisit)
{
echo
,,Sie haben uns in diesen Monat noch nicht
beehrt!
��;
}
else
{
echo ,,Ich letzter Besuch war am:
$lastvisit��;
}
$datum = date(,,d.m.Y
H:i:s��)
setcookie(lastvisit��, $datum,
time()+30*24*60*60); // 30
tage lang g�ltig
?>
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R�f�rence