What is the Basic Syntax of the http_build_query Function? How to Quickly Master Its Usage Examples?

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<p>[What is the Basic Syntax of the http_build_query Function? How to Quickly Master Its Usage Examples?]</p>
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<p>http_build_query is a very practical PHP function mainly used to convert arrays or objects into URL query strings.</p>
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<p>It is often used to generate GET request parameters or to quickly build query strings in API requests.</p>
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<p>Basic Syntax:</p>
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<p>string http_build_query(array $data, string $numeric_prefix = "", string $arg_separator = "&", int $encoding_type = PHP_QUERY_RFC1738)</p>
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<p>Parameter Description:</p>
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<p>$data: Required, an array or object, the key-value pairs to be converted.</p>
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<p>$numeric_prefix: Optional, adds a prefix if array indexes are numeric.</p>
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<p>$arg_separator: Optional, the separator between parameters, default is &.</p>
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<p>$encoding_type: Optional, encoding type, either PHP_QUERY_RFC1738 or PHP_QUERY_RFC3986.</p>
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<p>Basic Usage Examples:<br>
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<p>// Example 1: The simplest array conversion<br>
$params = [<br>
'name' => 'Alice',<br>
'age' => 25,<br>
'city' => 'Beijing'<br>
];</p>
<p>$queryString = http_build_query($params);<br>
echo $queryString;<br>
// Output: name=Alice&age=25&city=Beijing</p>
<p>// Example 2: Array with numeric indexes<br>
$numbers = [10, 20, 30];<br>
$queryString2 = http_build_query($numbers, 'num_');<br>
echo "\n" . $queryString2;<br>
// Output: num_0=10&num_1=20&num_2=30</p>
<p>// Example 3: Specify a parameter separator<br>
$queryString3 = http_build_query($params, '', ';');<br>
echo "\n" . $queryString3;<br>
// Output: name=Alice;age=25;city=Beijing</p>
<p>// Example 4: Using RFC3986 encoding<br>
$queryString4 = http_build_query($params, '', '&', PHP_QUERY_RFC3986);<br>
echo "\n" . $queryString4;<br>
// Output: name=Alice&age=25&city=Beijing (spaces and special characters will be percent-encoded)</p>
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<p>Quick Learning Tips:</p>
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<p>Start by memorizing the most basic array-to-string conversion method.</p>
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<p>Understand how numeric_prefix works for arrays with numeric indexes.</p>
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<p>Get familiar with arg_separator for parameter separation.</p>
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<p>Pay attention to how different encoding types affect URL safety.</p>
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<p>Summary:</p>
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<p data-is-last-node="">http_build_query allows you to quickly turn array data into usable URL query strings, making it very convenient for GET requests or API calls.<br>
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