What are String Functions in PHP?

Learn to use string functions in PHP, including strlen(), substr(), and strpos(). PHP provides a number of functions for manipulating strings. These functions are designed to avoid the manual process of concatenating together individual strings and to avoid common security problems that occur with string concatenation.

php string functions

JSMD on May 13, 2020

#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;

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PHP strings

Black Beetle on Jun 25, 2020

<?php
echo 'this is a simple string';

echo 'You can also have embedded newlines in
strings this way as it is
okay to do';

// Outputs: Arnold once said: "I'll be back"
echo 'Arnold once said: "I\'ll be back"';

// Outputs: You deleted C:\*.*?
echo 'You deleted C:\\*.*?';

// Outputs: You deleted C:\*.*?
echo 'You deleted C:\*.*?';

// Outputs: This will not expand: \n a newline
echo 'This will not expand: \n a newline';

// Outputs: Variables do not $expand $either
echo 'Variables do not $expand $either';
?>

Source: www.php.net

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strings php

Dark Dotterel on Jul 03, 2020

returning portion of a string

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String functions provide a set of tools to manipulate and return strings in PHP. And then goes on to describe the most commonly used string functions.

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What are String Functions in PHP?

php string functions

PHP strings

strings php

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