ÈÓã Çááå ÇáÑÍãä ÇáÑÍíã

* Ýí åÐå ÇáãÞÇáÉ ÓäÊÍÏË Úä ØÑíÞÉ ÇáÊÚÇãá ãÚ ÇáäÕæÕ Ýí ÇáÈí ÇÊÔ Èí .
äáÇÍÙ Çäå Ýí ÇáÈí ÇÊÔ Èí íÌÈ ÇÍÇØÉ Çí äÕ ÈÚáÇãÉ ÊäÕíÕ ãÒÏæÌÉ Çæ æÇÍÏÉ

 'I am a string in single quotes'

"I am a string in double quotes"

"I am not a valid string since I have unmatching quote marks'

'Me neither!"

$s = "I am a 'single quote string' inside a double quote string";

$s = 'I am a "double quote string" inside a single quote string';

$s = "I am a \'single quote string\' inside a double quote string";

$s = 'I am a \"double quote string\" inside a single quote string';
'You\'d better escape your apostrophes'

$file = "c:\windows\system.ini";
echo $file; // prints c:windowssystem.ini

$file = "c:\\windows\\system.ini";
echo $file; // prints c:\windows\system.ini

$head = <<<ENDH
$s = 'I am a "double quote string" inside a single quote string';
ENDH;

$first_name = 'Charlie';
$last_name  = 'Brown';
$full_name  = $first_name . ' ' . $last_name;

echo "foo is $foo";      // this prints:  foo is 2
echo 'foo is $foo';      // this prints:  foo is $foo

echo "value = $foo";
echo "value = $a[$i]";

echo 'value = ' . $a[$i][$j];
echo 'value = ' . $this->var;

select * from users where last_name = 'O'Keefe'

select * from users where last_name = 'O\'Keefe'

$last_name = "O'Keefe";
$sql = "select * from users where last_name = '" . addslashes($last_name) . "'";

$str1 = 'abc';
$str2 = 'def';

if (!strcmp($str1, $str2)) {
        // remember strcmp() returns zero if the strings are identical
}

if ($str1 == $str2) {
        // PHP can compare strings directly
}

if ($str1 == 'def') {
}

$str = substr('abcdef', 2, 3); // cde

$str = substr('abcdef', -2);     // ef
$str = substr('abcdef', -2, 1); // e

$str = substr('abcdef', 2, -2); // cd

str = substr('abcdef', ÇáÞíãÉ ÇáÇæáì,ÇáËÇäíÉ ÇáÞíãÉ );