PHP search word in string

preg_match — Perform a regular expression match.

Syntax :
int preg_match ( string $pattern , string $subject [, array &$matches [, int $flags = 0 [, int $offset = 0 ]]] )

preg_match() returns 1 if the pattern matches given subject, 0 if it does not, or FALSE if an error occurred.

 <?php

/* The \b in the pattern indicates a word boundary, so only the distinct
* word "web" is matched, and not a word partial like "webbing" or "cobweb" */

if (preg_match("/\bweb\b/i", "PHP is the web scripting language of choice.")) {
echo "A match was found.";
} else {
echo "A match was not found.";
}

//OUTPUT : A match was found.

if (preg_match("/\bweb\b/i", "PHP is the website scripting language of choice.")) {
echo "A match was found.";
} else {
echo "A match was not found.";
}

//OUTPUT : A match was not  found.
?>

Special  thanks to buriedunderground .

jquery ajax file upload php

This is HTML part:

<input id="sortpicture" type="file" name="sortpic" />

<button id="upload">Upload</button>

A PHP script is necessary to put the file uploaded to the server in the uploads directory. The jQuery ajax function directs the form data to the particular file that handles the upload.

$('#upload').on('click', function() {
    var file_data = $('#sortpicture').prop('files')[0];   
    var form_data = new FormData();                  
    form_data.append('file', file_data)
    alert(form_data);                             
    $.ajax({
                url: 'upload.php',
                dataType: 'text',
                cache: false,
                contentType: false,
                processData: false,
                data: form_data,                         
                type: 'post',
                success: function(data){
                    alert(data); 
                }
     });

});

upload.php:

<?php

    if ( 0 < $_FILES['file']['error'] ) {
        echo 'Error: ' . $_FILES['file']['error'] . '<br>';
    }
    else {
        move_uploaded_file($_FILES['file']['tmp_name'], 'uploads/' . $_FILES['file']['name']);
    }


?>

A couple things about the destination directory: 1) make sure you have the correct server path, and 2) make sure it's writeable.

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Differences between require and include, include_once and require_once

The include() statement includes and evaluates the specified file.The documentation below also applies to require(). The two constructs are identical in every way except how they handle failure. include() produces a Warning while require() results in a Fatal Error. In other words, use require() if you want a missing file to halt processing of the page.
include() does not behave this way, the script will continue regardless.

The include_once() statement includes and evaluates the specified file during the execution of the script. This is a behavior similar to the include() statement, with the only difference being that if the code from a file has already been included, it will not be included again. As the name suggests, it will be included just once.include_once() should be used in cases where the same file might be included and evaluated more than once during a particular execution of a script, and you want to be sure that it is included exactly once
to avoid problems with function redefinition's, variable value reassignments, etc.

require_once() should be used in cases where the same file might be included and evaluated
more than once during a particular execution of a script, and you want to be sure that it is included exactly once to avoid problems with function redefinitions, variable value
reassignments, etc.