php str ` code example

Example 1: php check if string contains word

$myString = 'Hello Bob how are you?';
if (strpos($myString, 'Bob') !== false) {
    echo "My string contains Bob";
}

Example 2: php obscure string

/**
 * @param string|string[] $plain
 * @param int             $revealStart
 * @param int             $revealEnd
 * @param string          $obscuration
 * @return string|string[]
 */
function obscure(
    $plain,
    int $revealStart = 1,
    int $revealEnd = 0,
    string $obscuration = '*'
) {
    if (is_array($plain)) {
        return array_map(
            function ($plainPart) use ($revealStart, $revealEnd, $obscuration) {
                return obscure($plainPart, $revealStart, $revealEnd, $obscuration);
            },
            $plain
        );
    }
    $plain = (string) $plain;
    return mb_substr($plain, 0, $revealStart)
        . str_repeat(
            $obscuration,
            max(
                0,
                mb_strlen($plain) -
                ($revealStart + $revealEnd)
            )
        )
        . mb_substr(
            $plain,
            -$revealEnd,
            $revealEnd
        );
}

Example 3: php string functions

#String Functions

substr()  #Returns a portion of a string
===========
<?php
    #substr()  Returns a portion of a string
    $output = substr('Hello', 1, 3);
    $output1 = substr('Hello', -2);//starts from the back of the string
    echo $output;
    echo '<br>';
    echo $output1;
?>
===============
strlen() #Returns the length of a string
===============
    $output = strlen('Hello');
    echo $output;
?>
===============
strpos() #finds the position of the first occurence of a sub string
===============
    $output = strpos('Hello World', 'o');
    echo $output;
    $output1 = strrpos('Hello World', 'o'); #last occurance
    echo $output1;
================
trim()  # trims white space
================
 $text = 'Hello World                ';
    var_dump($text);
    echo '<br>';
    $trimmed = trim($text);
    echo $trimmed;
    echo '<br>';
    var_dump($trimmed);
==================
strtoupper() # makes everything uppercase
==================
$text = 'Hello World';
    $uppercase = strtoupper($text);
    echo $uppercase;
==================
strtolower() #makes everything lowercase
==================
  $text = 'Hello World';
    $lowercase = strtolower($text);
    echo $lowercase;
==================
ucwords() #Capitalizes every word
===================
    $text = 'hello world';
    $proppercase = ucwords($text);
    echo $proppercase;
==================
str_replace() #Replace all occurances of a search string 
              #with a replacement
==================
$text = 'hello world';
    $wordreplace = str_replace('world', 'john', $text);
    echo $wordreplace;
=================
is_string() #Checks to see if it is a string
=================
    $val = 'Hello';
    $output = is_string($val);
    echo $output;
    echo '<br>';

    $values = array(true, false, null, 'abc', 33, '33',
    22.4, '22.4', '', ' ', 0, '0');

    foreach($values as $value){
        if(is_string($value)){
        echo "{$value} is a string<br>";
    }
}
=================
gzcompress() # Compress a string
=================
    $string = 
    "a;laksd;lk;lkasd;lkas;lk;lkd;lkasd;lka;lskd;lka;lkd;lk
    as;l;laksd;lk;lkasd;lkas;ldk;laskd;lakd;lkad;l
    adslkjlkasjdlkjlkjaslkjaslkdjlkajdlkajdlkajd
    alskdjlkasjdlkjadlkjadlkjadlkjadlajd
    adlkjlkjalksjdlkjlkjlkjklajsda";

    $compressed = gzcompress($string);
    
    echo $compressed;
    echo '<br>';

    $original = gzuncompress($compressed);

    echo $original;