в 10:37, 26 мая 2010

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2010-05-26T07:07:33Z

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==Double quotation marks allow the parsing of variables==



<source lang="html4strict">

<?
$name = "john";
print "hello, $name";
?>

</source>

==Double-quoted string escape sequences==



<source lang="html4strict">

Escape sequence Character
\n Newline (ASCII 10)
\r Carriage return (ASCII 13)
\t Tab (ASCII 9)
\\ Backslash
\$ Dollar sign
\" Double quotes
\0 through \777 Octal value
\x0 through \xFF Hex value

</source>

==Double-quoted strings==



<source lang="html4strict">

<?
print "I"ve gone to the store.";
print "The sauce cost \$10.25.";
$cost = "$10.25";
print "The sauce cost $cost.";
print "The sauce cost \$\061\060.\x32\x35.";
?>

</source>

==Fixing quote escaping in backreference replacements==



<source lang="html4strict">

<?php
$html = "<code><b> It"s bold </b></code>";
print preg_replace("@<code>(.*?)</code>@e","preg_html_entity_decode("$1")", $html);
print "\n";
$html = "<code><i> "This" is italic. </i></code>";
print preg_replace("@<code>(.*?)</code>@e","preg_html_entity_decode("$1")", $html);
print "\n";
function preg_html_entity_decode($s) {
$s = str_replace("\\"",""", $s);
return html_entity_decode($s);
}
?>

</source>

==If you use single quotation marks to enclose the same string, the variable is not substituted:==



<source lang="html4strict">

<?
print "hello, $name"; // hello, $name
?>
Double-quoted strings are also parsed for escape characters.

</source>

==It is safe to use non-escaped Windows-style filenames in your single-quoted strings==



<source lang="html4strict">

<?php
$filename = "c:\windows\me.txt";
echo $filename;
?>

</source>

==Using forward slashes on Windows==



<source lang="html4strict">

<?php
$fh = fopen("c:/alligator/crocodile menu.txt","r") or die($php_errormsg);
while($s = fgets($fh)) {
print $s;
}
fclose($fh) or die($php_errormsg);
?>

</source>

==Various special characters in string assignments==



<source lang="html4strict">

<?php
$newline = "A newline is \n";
$return = "A carriage return is \r";
$tab = "A tab is \t";
$dollar = "A dollar sign is \$";
$doublequote = "A double-quote is \"";
?>

</source>

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PHP/String/Quotation - История изменений

в 10:37, 26 мая 2010

Admin: 1 версия