Operatoren und Strings

<?php
echo 7 + 2, " ", 7 - 2, " ", 7 * 2, " ", 7 / 2, " ", 7 % 3, " ", 2 ** 8, " ", intdiv(7, 2), "\n";
$x = 10; $x += 5; $x -= 3; $x *= 2; $x /= 4; $x .= "!";
echo $x, "\n";
$i = 5; echo $i++, " ", ++$i, " ", $i--, " ", --$i, "\n";

var_dump(5 <=> 3, "a" <=> "b", [1, 2] <=> [1, 3]);       // Spaceship: -1, 0, 1
var_dump(true && false, true || false, !true, true xor true);
var_dump(5 & 3, 5 | 3, 5 ^ 3, ~5, 1 << 4, 256 >> 2);

echo true ? "ja" : "nein", "\n";                  // ternär
echo null ?: "Elvis", "\n";                       // kurze Form: erster truthy Wert
echo null ?? "Coalesce", "\n";

9 5 14 3.5 1 256 3
6!
5 7 7 5
int(1)
int(-1)
int(-1)
bool(false)
bool(true)
bool(false)
bool(false)
int(1)
int(7)
int(6)
int(-6)
int(16)
int(64)
ja
Elvis
Coalesce

<?php
$name = "Mia";
$alter = 17;
echo "Name: $name, Alter: {$alter}\n";           // Interpolation
echo 'Roh: $name\n', "\n";                         // einfache Quotes: nichts ersetzt
echo "Tab:\tZeilenumbruch:\\nAnführung: \"x\" Unicode: \u{1F600}\n";
echo "Summe: " . ($alter + 1) . "\n";             // Verketten mit .

$mehrzeilig = <<<TEXT
Hallo $name,
du bist $alter Jahre alt.
  Einrückung bleibt relativ.
TEXT;
echo $mehrzeilig, "\n";

echo <<<'ROH'
Nowdoc: $name wird nicht ersetzt
ROH;
echo "\n";

Name: Mia, Alter: 17
Roh: $name\n
Tab:	Zeilenumbruch:\nAnführung: "x" Unicode: 😀
Summe: 18
Hallo Mia,
du bist 17 Jahre alt.
  Einrückung bleibt relativ.
Nowdoc: $name wird nicht ersetzt

<?php
$s = "  Hallo Welt  ";
echo strlen($s), "|", trim($s), "|", ltrim($s), "|", rtrim($s), "|\n";
echo strtoupper("abc"), strtolower("ABC"), ucfirst("mia"), ucwords("max muster"), "\n";
echo str_replace("Welt", "PHP", "Hallo Welt"), " ", substr("Datenbank", 0, 5), " ", substr("Datenbank", -4), "\n";
var_dump(strpos("Hallo", "l"), strrpos("Hallo", "l"), strpos("Hallo", "x"), str_contains("Hallo", "all"), str_starts_with("Hallo", "Ha"), str_ends_with("Hallo", "lo"));
echo str_repeat("=", 10), " ", strrev("abc"), " ", str_pad("7", 3, "0", STR_PAD_LEFT), " ", wordwrap("Ein langer Satz hier", 10, "\n", true), "\n";
print_r(explode(",", "a,b,c"));
echo implode(" | ", ["x", "y", "z"]), "\n";
echo number_format(1234567.891, 2, ",", "."), " ", nl2br("a\nb"), " ", htmlspecialchars("<b>\"x\"</b>"), "\n";
print_r(str_split("abcdef", 2));
echo similar_text("Hallo", "Hello"), " ", levenshtein("kitten", "sitting"), " ", ucfirst(strrev("dlrow")), "\n";

14|Hallo Welt|Hallo Welt  |  Hallo Welt|
ABCabcMiaMax Muster
Hallo PHP Daten bank
int(2)
int(3)
bool(false)
bool(true)
bool(true)
bool(true)
========== cba 007 Ein langer
Satz hier
Array
(
    [0] => a
    [1] => b
    [2] => c
)
x | y | z
1.234.567,89 a<br />
b &lt;b&gt;&quot;x&quot;&lt;/b&gt;
Array
(
    [0] => ab
    [1] => cd
    [2] => ef
)
4 3 World

<?php
$text = "Grüße";
echo strlen($text), " ", mb_strlen($text), " ", mb_strtoupper($text), " ", mb_substr($text, 0, 3), " ", mb_str_pad("ä", 3, "-") ?? '', "\n";

7 5 GRÜSSE Grü ä--

<?php
printf("%s ist %d Jahre alt (%.1f m)\n", "Mia", 17, 1.68);
printf("[%5d] [%-5d] [%05d] [%x] [%b]\n", 42, 42, 42, 255, 5);
printf("%2\$s %1\$s %2\$s\n", "a", "b");
echo date("Y-m-d", 0), " ", date("D, d M Y", 86400 * 365), "\n";

Mia ist 17 Jahre alt (1.7 m)
[   42] [42   ] [00042] [ff] [101]
b a b
1970-01-01 Fri, 01 Jan 1971