Var_dump - Manual - PHP

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(PHP 4, PHP 5, PHP 7, PHP 8)

var_dump — Muestra información sobre una variable

Descripción

var_dump(mixed $value, mixed ...$values): void

var_dump() muestra información estructurada sobre una variable, incluyendo su tipo y valor. Los arrays y objetos son explorados recursivamente, con indentaciones, para resaltar su estructura.

Todas las propiedades públicas, privadas y protegidas de los objetos serán mostradas en la salida a menos que el objeto implemente un método __debugInfo().

Sugerencia

Al igual que con todas las funciones que muestran directamente resultados al navegador, las funciones de gestión de salida pueden ser utilizadas para capturar la salida de esta función y almacenarla en un string (por ejemplo).

Parámetros

value

La expresión a mostrar.

values

Expresión adicional a mostrar.

Valores devueltos

No se retorna ningún valor.

Ejemplos

Ejemplo #1 Ejemplo con var_dump()

<?php$a = array(1, 2, array("a", "b", "c"));var_dump($a);?>

El ejemplo anterior mostrará:

array(3) { [0]=> int(1) [1]=> int(2) [2]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" } } <?php$b = 3.1;$c = true;var_dump($b, $c);?>

El ejemplo anterior mostrará:

float(3.1) bool(true)

Ver también

print_r() - Muestra información legible para una variable
debug_zval_dump() - Extrae una representación en forma de string de la estructura interna de una zval para su visualización
var_export() - Devuelve el código PHP utilizado para generar una variable
__debugInfo()

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User Contributed Notes 14 notes

up down 159 rich dot schu at gmail dot com ¶17 years ago Keep in mind if you have xdebug installed it will limit the var_dump() output of array elements and object properties to 3 levels deep. To change the default, edit your xdebug.ini file and add the folllowing line: xdebug.var_display_max_depth=n More information here: http://www.xdebug.org/docs/display up down 139 edwardzyang at thewritingpot dot com ¶20 years ago If you're like me and uses var_dump whenever you're debugging, you might find these two "wrapper" functions helpful. This one automatically adds the PRE tags around the var_dump output so you get nice formatted arrays. <?php function var_dump_pre($mixed = null) { echo '<pre>'; var_dump($mixed); echo '</pre>'; return null; } ?> This one returns the value of var_dump instead of outputting it. <?php function var_dump_ret($mixed = null) { ob_start(); var_dump($mixed); $content = ob_get_contents(); ob_end_clean(); return $content; } ?> Fairly simple functions, but they're infinitely helpful (I use var_dump_pre() almost exclusively now). up down 36 b dot bergloev at gmail dot com ¶11 years ago I post a new var_dump function with colors and collapse features. It can also adapt to terminal output if you execute it from there. No need to wrap it in a pre tag to get it to work in browsers. <?php function dump_debug($input, $collapse=false) { $recursive = function($data, $level=0) use (&$recursive, $collapse) { global $argv; $isTerminal = isset($argv); if (!$isTerminal && $level == 0 && !defined("DUMP_DEBUG_SCRIPT")) { define("DUMP_DEBUG_SCRIPT", true); echo '<script language="Javascript">function toggleDisplay(id) {'; echo 'var state = document.getElementById("container"+id).style.display;'; echo 'document.getElementById("container"+id).style.display = state == "inline" ? "none" : "inline";'; echo 'document.getElementById("plus"+id).style.display = state == "inline" ? "inline" : "none";'; echo '}</script>'."\n"; } $type = !is_string($data) && is_callable($data) ? "Callable" : ucfirst(gettype($data)); $type_data = null; $type_color = null; $type_length = null; switch ($type) { case "String": $type_color = "green"; $type_length = strlen($data); $type_data = "\"" . htmlentities($data) . "\""; break; case "Double": case "Float": $type = "Float"; $type_color = "#0099c5"; $type_length = strlen($data); $type_data = htmlentities($data); break; case "Integer": $type_color = "red"; $type_length = strlen($data); $type_data = htmlentities($data); break; case "Boolean": $type_color = "#92008d"; $type_length = strlen($data); $type_data = $data ? "TRUE" : "FALSE"; break; case "NULL": $type_length = 0; break; case "Array": $type_length = count($data); } if (in_array($type, array("Object", "Array"))) { $notEmpty = false; foreach($data as $key => $value) { if (!$notEmpty) { $notEmpty = true; if ($isTerminal) { echo $type . ($type_length !== null ? "(" . $type_length . ")" : "")."\n"; } else { $id = substr(md5(rand().":".$key.":".$level), 0, 8); echo "<a href=\"javascript:toggleDisplay('". $id ."');\" style=\"text-decoration:none\">"; echo "" . $type . ($type_length !== null ? "(" . $type_length . ")" : "") . ""; echo "</a>"; echo " ⤵"; echo "<div id=\"container". $id ."\" style=\"display: " . ($collapse ? "" : "inline") . ";\">"; echo " "; } for ($i=0; $i <= $level; $i++) { echo $isTerminal ? "| " : "|        "; } echo $isTerminal ? "\n" : " "; } for ($i=0; $i <= $level; $i++) { echo $isTerminal ? "| " : "|        "; } echo $isTerminal ? "[" . $key . "] => " : "[" . $key . "] => "; call_user_func($recursive, $value, $level+1); } if ($notEmpty) { for ($i=0; $i <= $level; $i++) { echo $isTerminal ? "| " : "|        "; } if (!$isTerminal) { echo "</div>"; } } else { echo $isTerminal ? $type . ($type_length !== null ? "(" . $type_length . ")" : "") . " " : "" . $type . ($type_length !== null ? "(" . $type_length . ")" : "") . "  "; } } else { echo $isTerminal ? $type . ($type_length !== null ? "(" . $type_length . ")" : "") . " " : "" . $type . ($type_length !== null ? "(" . $type_length . ")" : "") . "  "; if ($type_data != null) { echo $isTerminal ? $type_data : "" . $type_data . ""; } } echo $isTerminal ? "\n" : " "; }; call_user_func($recursive, $input); } ?> up down 6 stlawson *AT* joyfulearthtech *DOT* com ¶14 years ago <?php /** * Better GI than print_r or var_dump -- but, unlike var_dump, you can only dump one variable. * Added htmlentities on the var content before echo, so you see what is really there, and not the mark-up. * * Also, now the output is encased within a div block that sets the background color, font style, and left-justifies it * so it is not at the mercy of ambient styles. * * Inspired from: PHP.net Contributions * Stolen from: [highstrike at gmail dot com] * Modified by: stlawson *AT* JoyfulEarthTech *DOT* com * * @param mixed $var -- variable to dump * @param string $var_name -- name of variable (optional) -- displayed in printout making it easier to sort out what variable is what in a complex output * @param string $indent -- used by internal recursive call (no known external value) * @param unknown_type $reference -- used by internal recursive call (no known external value) */ function do_dump(&$var, $var_name = NULL, $indent = NULL, $reference = NULL) { $do_dump_indent = "|    "; $reference = $reference.$var_name; $keyvar = 'the_do_dump_recursion_protection_scheme'; $keyname = 'referenced_object_name'; // So this is always visible and always left justified and readable echo "<div style='text-align:left; background-color:white; font: 100% monospace; color:black;'>"; if (is_array($var) && isset($var[$keyvar])) { $real_var = &$var[$keyvar]; $real_name = &$var[$keyname]; $type = ucfirst(gettype($real_var)); echo "$indent$var_name $type = &$real_name "; } else { $var = array($keyvar => $var, $keyname => $reference); $avar = &$var[$keyvar]; $type = ucfirst(gettype($avar)); if($type == "String") $type_color = ""; elseif($type == "Integer") $type_color = ""; elseif($type == "Double"){ $type_color = ""; $type = "Float"; } elseif($type == "Boolean") $type_color = ""; elseif($type == "NULL") $type_color = ""; if(is_array($avar)) { $count = count($avar); echo "$indent" . ($var_name ? "$var_name => ":"") . "$type ($count) $indent( "; $keys = array_keys($avar); foreach($keys as $name) { $value = &$avar[$name]; do_dump($value, "['$name']", $indent.$do_dump_indent, $reference); } echo "$indent) "; } elseif(is_object($avar)) { echo "$indent$var_name $type $indent( "; foreach($avar as $name=>$value) do_dump($value, "$name", $indent.$do_dump_indent, $reference); echo "$indent) "; } elseif(is_int($avar)) echo "$indent$var_name = $type(".strlen($avar).") $type_color".htmlentities($avar)." "; elseif(is_string($avar)) echo "$indent$var_name = $type(".strlen($avar).") $type_color\"".htmlentities($avar)."\" "; elseif(is_float($avar)) echo "$indent$var_name = $type(".strlen($avar).") $type_color".htmlentities($avar)." "; elseif(is_bool($avar)) echo "$indent$var_name = $type(".strlen($avar).") $type_color".($avar == 1 ? "TRUE":"FALSE")." "; elseif(is_null($avar)) echo "$indent$var_name = $type(".strlen($avar).") {$type_color}NULL "; else echo "$indent$var_name = $type(".strlen($avar).") ".htmlentities($avar)." "; $var = $var[$keyvar]; } echo "</div>"; } ?> up down 9 anon ¶20 years ago var_dump(get_defined_vars()); will dump all defined variables to the browser. up down 5 php at mikeboers dot com ¶18 years ago Howdy! I am working on a pretty large project where I needed to dump a human readable form of whatever into the log files... and I thought var_export was too difficult to read. BigueNique at yahoo dot ca has a nice solution, although I needed to NOT modify whatever was being passed to dump. So borrowing heavily from BigueNique's (just reworked his function) and someone's idea over in the object cloning page, I came up with the following function. It makes a complete copy of whatever object you initially pass it, including all recursive definitions and outside objects references, then does the same thing as BigueNique's function. I also heavily reworked what it output, to suit my needs. <?php function var_log(&$varInput, $var_name='', $reference='', $method = '=', $sub = false) { static $output ; static $depth ; if ( $sub == false ) { $output = '' ; $depth = 0 ; $reference = $var_name ; $var = serialize( $varInput ) ; $var = unserialize( $var ) ; } else { ++$depth ; $var =& $varInput ; } // constants $nl = "\n" ; $block = 'a_big_recursion_protection_block'; $c = $depth ; $indent = '' ; while( $c -- > 0 ) { $indent .= '| ' ; } // if this has been parsed before if ( is_array($var) && isset($var[$block])) { $real =& $var[ $block ] ; $name =& $var[ 'name' ] ; $type = gettype( $real ) ; $output .= $indent.$var_name.' '.$method.'& '.($type=='array'?'Array':get_class($real)).' '.$name.$nl; // havent parsed this before } else { // insert recursion blocker $var = Array( $block => $var, 'name' => $reference ); $theVar =& $var[ $block ] ; // print it out $type = gettype( $theVar ) ; switch( $type ) { case 'array' : $output .= $indent . $var_name . ' '.$method.' Array ('.$nl; $keys=array_keys($theVar); foreach($keys as $name) { $value=&$theVar[$name]; var_log($value, $name, $reference.'["'.$name.'"]', '=', true); } $output .= $indent.')'.$nl; break ; case 'object' : $output .= $indent.$var_name.' = '.get_class($theVar).' {'.$nl; foreach($theVar as $name=>$value) { var_log($value, $name, $reference.'->'.$name, '->', true); } $output .= $indent.'}'.$nl; break ; case 'string' : $output .= $indent . $var_name . ' '.$method.' "'.$theVar.'"'.$nl; break ; default : $output .= $indent . $var_name . ' '.$method.' ('.$type.') '.$theVar.$nl; break ; } // $var=$var[$block]; } -- $depth ; if( $sub == false ) return $output ; } // var_log( $var, '$name' ) ; ?> Hope it works well for you! up down 2 Anonymous ¶9 years ago Be careful this outputs to stdout stream (1) instead of the proper stderr stream (2). up down 3 highstrike at gmail dot com ¶17 years ago made 2 nifty functions based of what some people contributed here. Hope you find them usefull usage ... call for the dump function. EG: dump($array, "Array dump"); <?php //////////////////////////////////////////////////////// // Function: dump // Inspired from: PHP.net Contributions // Description: Helps with php debugging function dump(&$var, $info = FALSE) { $scope = false; $prefix = 'unique'; $suffix = 'value'; if($scope) $vals = $scope; else $vals = $GLOBALS; $old = $var; $var = $new = $prefix.rand().$suffix; $vname = FALSE; foreach($vals as $key => $val) if($val === $new) $vname = $key; $var = $old; echo "<pre style='margin: 0px 0px 10px 0px; display: block; background: white; color: black; font-family: Verdana; border: 1px solid #cccccc; padding: 5px; font-size: 10px; line-height: 13px;'>"; if($info != FALSE) echo "$info: "; do_dump($var, '$'.$vname); echo "</pre>"; } //////////////////////////////////////////////////////// // Function: do_dump // Inspired from: PHP.net Contributions // Description: Better GI than print_r or var_dump function do_dump(&$var, $var_name = NULL, $indent = NULL, $reference = NULL) { $do_dump_indent = "|    "; $reference = $reference.$var_name; $keyvar = 'the_do_dump_recursion_protection_scheme'; $keyname = 'referenced_object_name'; if (is_array($var) && isset($var[$keyvar])) { $real_var = &$var[$keyvar]; $real_name = &$var[$keyname]; $type = ucfirst(gettype($real_var)); echo "$indent$var_name $type = &$real_name "; } else { $var = array($keyvar => $var, $keyname => $reference); $avar = &$var[$keyvar]; $type = ucfirst(gettype($avar)); if($type == "String") $type_color = ""; elseif($type == "Integer") $type_color = ""; elseif($type == "Double"){ $type_color = ""; $type = "Float"; } elseif($type == "Boolean") $type_color = ""; elseif($type == "NULL") $type_color = ""; if(is_array($avar)) { $count = count($avar); echo "$indent" . ($var_name ? "$var_name => ":"") . "$type ($count) $indent( "; $keys = array_keys($avar); foreach($keys as $name) { $value = &$avar[$name]; do_dump($value, "['$name']", $indent.$do_dump_indent, $reference); } echo "$indent) "; } elseif(is_object($avar)) { echo "$indent$var_name $type $indent( "; foreach($avar as $name=>$value) do_dump($value, "$name", $indent.$do_dump_indent, $reference); echo "$indent) "; } elseif(is_int($avar)) echo "$indent$var_name = $type(".strlen($avar).") $type_color$avar "; elseif(is_string($avar)) echo "$indent$var_name = $type(".strlen($avar).") $type_color\"$avar\" "; elseif(is_float($avar)) echo "$indent$var_name = $type(".strlen($avar).") $type_color$avar "; elseif(is_bool($avar)) echo "$indent$var_name = $type(".strlen($avar).") $type_color".($avar == 1 ? "TRUE":"FALSE")." "; elseif(is_null($avar)) echo "$indent$var_name = $type(".strlen($avar).") {$type_color}NULL "; else echo "$indent$var_name = $type(".strlen($avar).") $avar "; $var = $var[$keyvar]; } } ?> up down 3 egorinsk at gmail com ¶16 years ago Note that var_dump reset()'s array internal pointer! up down 2 david at exposito dot mobi ¶15 years ago If you want to save exactly the content of an array into a variable to save ir later for example, use this: <?php $xml = var_export($xml, true); ?> You'll have in your same variable the content readable, instead of written down or anything else up down 4 thriller dot ze at gmail dot com ¶18 years ago As Bryan said, it is possible to capture var_dump() output to a string. But it's not quite exact if the dumped variable contains HTML code. You can use this instead: <?php echo '<pre>'; // This is for correct handling of newlines ob_start(); var_dump($var); $a=ob_get_contents(); ob_end_clean(); echo htmlspecialchars($a,ENT_QUOTES); // Escape every HTML special chars (especially > and < ) echo '</pre>'; ?> up down 2 vladimir at pixeltomorrow dot com ¶18 years ago You can also use the PEAR package available at http://pear.php.net/package/Var_Dump which parses the variable content in a very pleasant manner, a lot more easier to "follow" than the built-in var_dump() function. Of course there are many others, but I prefer this one, because it's simply to use. Just add at the begining of your file: <?php require('Var_Dump.php'); // make sure the pear package path is set in php.ini Var_Dump::displayInit(array('display_mode' => 'HTML4_Text'), array('mode' => 'normal','offset' => 4)); ?> then, instead of simply using var_dump($foo), use: <?php Var_Dump::display($foo); ?> Read the documentation if you're looking for different output layouts. Cheers! Vladimir Ghetau up down 2 kobrasrealm at gmail dot com ¶14 years ago I wrote this dandy little function for using var_dump() on HTML documents so I don't have to view the source. <?php function htmldump($variable, $height="9em") { echo "<pre style=\"border: 1px solid #000; height: {$height}; overflow: auto; margin: 0.5em;\">"; var_dump($variable); echo "</pre>\n"; } ?> You can pass arguments like this: <?php $sql = mysql_query("SELECT id, name, value FROM table WHERE cond = 'value'"); $s = mysql_fetch_assoc($sql); // Dump variable containing the result of the MySQL query var_dump($s); ?> The second parameter lets you specify the height of the box. Default is 9em, but if you're expecting a huge output you'll probably want a higher value. <?php var_dump($s, "17em"); ?> Happy var_dumping. up down -2 fabien dot villepinte at gmail dot com ¶6 years ago It's important to note that the output depends on the precision directive. <?php var_dump(10000000000000.5); // float(10000000000000) ini_set('precision',-1); var_dump(10000000000000.5); // float(10000000000000.5) ?> ＋add a note

Funciones de manejo de variables
- boolval
- debug_zval_dump
- doubleval
- empty
- floatval
- get_debug_type
- get_defined_vars
- get_resource_id
- get_resource_type
- gettype
- intval
- is_array
- is_bool
- is_callable
- is_countable
- is_double
- is_float
- is_int
- is_integer
- is_iterable
- is_long
- is_null
- is_numeric
- is_object
- is_real
- is_resource
- is_scalar
- is_string
- isset
- print_r
- serialize
- settype
- strval
- unserialize
- unset
- var_dump
- var_export

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Từ khóa » Dd Trong Php

Var_dump - Manual - PHP

Descripción

Parámetros

Valores devueltos

Ejemplos

Ver también

Found A Problem?

User Contributed Notes 14 notes

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