It runs an XPath query on XML data
XPath is a major element in the XSLT standard.
XPath can be used to navigate through elements and attributes in an XML document.
XPath stands for XML Path Language
XPath uses “path like” syntax to identify and navigate nodes in an XML document
XPath contains over 200 built-in functions
XPath is a major element in the XSLT standard
XPath is a W3C recommendation
Example
<?php
XML
<?xml version=”1.0″ encoding=”ISO-8859-1″?>
It compares two strings from a specified start position
This function returns:
Example
<?php
echo substr_compare("phpcodexc","phpcode",0);
?>
Output
2
It calculates the soundex key of a string
A soundex key is a four character long alphanumeric string that represent English pronunciation of a word.
The soundex() function can be used for spelling applications.
The soundex() function creates the same key for similar sounding words.
Example
<?php
echo soundex("phpcode");
?>
Output
P123
The quotemeta() function adds backslashes in front of some predefined characters in a string.
This function can be used to escape characters with special meanings, such as ( ), [ ], and * in SQL.
This function is binary-safe.
The predefined characters are:
period (.)
backslash (\)
plus sign (+)
asterisk (*)
question mark (?)
brackets ([])
caret (^)
dollar sign ($)
parenthesis (())
Example
<?php
echo quotemeta("php(code)'");
?>
Output
php(code)’
It calculate the metaphone key of a string
A metaphone key represents how a string sounds if said by an English speaking person.
The metaphone() function can be used for spelling applications.
The metaphone() function creates the same key for similar sounding words.
The generated metaphone keys vary in length.
Example
<?php
echo metaphone("phpcode");
?>
Output
FPKT
It converts predefined characters to HTML entities. The predefined characters are:
& (ampersand) becomes &
” (double quote) becomes "
‘ (single quote) becomes '
< (less than) becomes <
> (greater than) becomes >
Example
<?php
echo htmlspecialchars("<a href='http://phpcodez.comt'>phpcode</a>");
?>
Output
<a href=’http://phpcodez.comt’>phpcode</a>
It returns information about a file path
Example
<?php
echo "<pre>";
print_r(pathinfo("test.ini"));
?>
Output
Array
It moves an uploaded file to a new location. It is used to validate whether the contents of $_FILES[‘name’][‘tmp_name’] have really been uploaded via HTTP, and also save the contents into another folder.
Example
<?php
move_uploaded_file($tmp_name, $_FILES["file"]["name"]) or die("Failed");
?>
The fpassthru() function reads all data from the current position in an open file, until EOF, and writes the result to the output buffer.
This function returns the number of characters passed or FALSE on failure.
Example
<?php
$fp = @fopen(“test.txt”, “r”);
fpassthru($fp);
?>
It return the current key and value pair from an array and advance the array cursor
Example
<?php
echo "<pre>";
$array = array("php", "asp", "jsp", "as", "js");
$array2 = each($array);
print_r($array2);
?>
Output
Array
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Beginners' Guide , PHP Programmer , Zend Certified Engineer , Magento Certified Developer
