- 1). Open a text editor and create a new file and name it "getH1Tags.php." Add a PHP open delimiter ("<?php") and a PHP close delimiter ("?>") to the file. Any text placed between these two delimiters will be parsed as PHP code by the PHP program.
<?php
?> - 2). Declare a PHP variable named "$htmlString". This variable contains the HTML that will be parsed for the "<h1>" tag fetch. For example, "$htmlString" contains the HTML text "<html><head></head><body><h1>first header</h1><h1>second header</h1></body></html>".
<?php
$htmlString = "<html><head></head><body><h1>first header</h1><h1>second header</h1></body></html>";
?> - 3). Declare a second PHP variable named "$matchPattern". This variable contains the values found in "$htmlString" that should be fetched, the values between the "<h1>" and "</h1>" tags. Use a regular expression to create the "$matchPattern" variable.
<?php
$htmlString = "<html><head></head><body><h1>first header</h1><h1>second header</h1></body></html>";
$matchPattern = "/<h1>(.*?)<\/h1>/";
?> - 4). Use the PHP "preg_match_all" function to perform a regular expression match on the "$htmlString" variable using the "$matchPattern" regular expression. The "preg_match_all" function takes four arguments: "$matchPattern" (the pattern to match, or "/<h1>(.*?)<\/h1>/"), "$htmlString" (the string to search for the pattern), "$foundIt" (the array of matches), and an optional flag (PREG_PATTERN_ORDER) that orders the results.
<?php
$htmlString = "<html><head></head><body><h1>first header</h1><h1>second header</h1></body></html>";
$matchPattern = "/<h1>(.*?)<\/h1>/";
preg_match_all($matchPattern, $htmlString, $foundIt, PREG_PATTERN_ORDER);
?> - 5). Use the PHP "echo" language construct to print the text between the first set of "<h1>" and "</h1>" tags found in the "$htmlString" variable. The PHP "preg_match_all" function returns a multidimensional array, so use brackets to indicate that the first string matched should be returned.
<?php
$htmlString = "<html><head></head><body><h1>first header</h1><h1>second header</h1></body></html>";
$matchPattern = "/<h1>(.*?)<\/h1>/";
preg_match_all($matchPattern, $htmlString, $foundIt, PREG_PATTERN_ORDER);
echo $foundIt[1][0]
?> - 6). Use the PHP concatenation operator (".") to print a separator comma immediately following the first string match (",").
<?php
$htmlString = "<html><head></head><body><h1>first header</h1><h1>second header</h1></body></html>";
$matchPattern = "/<h1>(.*?)<\/h1>/";
preg_match_all($matchPattern, $htmlString, $foundIt, PREG_PATTERN_ORDER);
echo $foundIt[1][0] . ", "
?> - 7). Use the PHP "echo" language construct to print a second PHP concatenation operator (".") and the text between the second set of "<h1>" and "</h1>" tags found in the "$htmlString" variable. Since the PHP "preg_match_all" function returns a multidimensional array, use brackets to indicate that the second string matched should be returned.
<?php
$htmlString = "<html><head></head><body><h1>first header</h1><h1>second header</h1></body></html>";
$matchPattern = "/<h1>(.*?)<\/h1>/";
preg_match_all($matchPattern, $htmlString, $foundIt, PREG_PATTERN_ORDER);
echo $foundIt[1][0] . ", " . $foundIt[1][1];
?> - 8). Open "getH1Tags.php" in a Web browser. Verify that the two "<h1>" tags in the "$htmlString" variable are written to the page separated by a comma.
previous post
next post